ArcticFox

HOLY S*** That's gonna take a lot of time to get all those items

Maybe.
But don't think of it as a recipe, like you have to do those things.
Think of it more as a philosophy of what tactics work.
For example, I was lucky enough to get a Rusty Energy Armor and a Distance Shredder.  I use them on my physical mech.  It's not the Mercy + Distance Shredder combo that's usually the best physical mech, and I don't have physical resistance drainers, but it works for me.  Quite handy against energy mechs.
You may never build something in META, but you can do things that are similar to META.  Here's my physical mech, the example I gave:

That phys mech is pretty much the mech I wanted to build but with rock recoiler before I lost the account TnT

No, i only have a monkey, no meta torso.or legs, i just got a claw though.bi would like to get a charge
The first mech you want to do, i need terrorblade and backstabber but only terrorblade to make the one i want now that i have the claw
Of couse i have no fortress but ill soon get a second platinum plating and no double things either but i have a mighty, anyways i want to make a hugger from a moment

@LittleFox Ok, after I further reviewed your items, this is how I would split up the mechs:

I would get a melee weapon for this energy mech so that you can then remove the Hot Flash.  I only put it there because you might end up with a "range 3" hole if I don't.  Viking Hammer and Storm Weaver are good options.

This is the best compromise I can think of.  But I'll be honest: if you had a corrupt light, I would be using hammer, shadow wolf, corrupt light, and desert snake.  The point being it's like you have a half-and-half tactics set.  Hammer punches them out to range 4 where desert snake can pull them back in.  Red rain can pull them close enough to use Heronmark.  It's wonky but it could work in theory.

So you're a bit over-stocked on close range, but this could work temporarily.  I would recommend obtaining grapple, charge, and teleport for this mech.  Also, I would recommend another heat engine.  HSA isn't the best physical torso but it's good, and so I would run with it and only upgrade it to Lightning Platinum Vest or Molten Platinum Vest.
In all the mechs I tried to distribute items as fairly as possible but that wasn't always possible.  I would try to have essentially 3 of each type engine and 1 of each type mass booster on each mech, but the CSUs can also work (as you see in the pictures).
Future directions:
Replace Zarkares with Windigo when you get it mythical and it's got about the same amount of hit points, as it has more resistance (especially to physical). Replace Grim Reaper with Lightning Platinum Vest, Molten Platinum Vest, Rusty Energy Armor, or Fractured Heat Armor.  Grim Reaper doesn't have the hit points.  (No, the solution is not to buff Grim Reaper.) Obtain overload protectors and quad core boosters over time by saving your tokens for Premium Packs and for refueling when farming the item portals.  The mid ranks are full of drainers and boilers, so that's why I prioritized heat and energy modules.  Once you get combined premium modules, you'll have saved the weight to start putting platinum plates on. Get Massive Legs for all three mechs.  They are better.  Also, The Claw for your physical mech if you don't mind its limitations, but only if you use grapple, charge, teleport, and terror cry (in place of disintegration). Stop upgrading the max protectors and wait until you get fortresses and/or individual L-M resist modules enough that you can switch over.  This requires a lot of premium modules, so be patient.  

The "don't buff Grim Reaper" is more of a comment meant for others who may read what I type 🙂
Why do you have a repulsor on your physical mech when you don't have 4-8 range weapons?
Good luck.  I wish you the best of drops 🙂

You have items for boiler build too 
Do you want it or you've just chosen your builds? 

It's a build distroyes enemy's shot down

You can replace one of heat bombs with corropt light or flaminator 
Also legs can replaced with sparked runners 

Yeah I've got a long list of things I want to mythical and max out and divine.... 🙂 

divine is like too expensive for many items so i don't usually do this

i mean what kind of boiler build do i have?
it's just heat items

boiler build?

thanks though

I already have them in epic, but i need to upgrade them, what my question on this topic was is what are the best mechs i can do? not  What are the best mechs i could possibly do in the future? 

It's hard though, to get all of these items. get one item of this list is easy, but all of them is harder as the listen shortens. 
i could do this one, need to mythical two items
and there is a problem, if you look at my inventory you can see there are only 3 cooling mass boosters, not 5
What's my problem with quoting again and again

because i already know all this
actually i just opened a box and i got rock recoiler.
And i don't think they are easy to get for me, i can't even manage to get a charge after 194 levels

i already know i have to switch to naga. don't give me tips, i simply want mechs. the thing is that i don't have any hysteria. not two corrupt lights either, no rock recoiler, no backfire physical thing. and you know even if an energy mech doesn't have much hp, if it removes all energy and destroys opponent's life with bunker shell and cockpit electrocuter it is enough.

i forgot to tell you i had a level 30 epic corrupt light, i actually have one
Personnal list of "To mythical" :
 
- selfish protector
- desintegration
- mighty protector
- grim cobra
- windigo
- corrupt light
- mods
- heat items
 

Because sometimes energy mech were pushing me on wall for sniper, or to get away recoil jumpers weapons. I have a lot of items to mythical
You too😁

About the heat mech. It is my actual tactic. I already stopped upgrading max protectors. I have a mighty, lets hope i get others. I have claw and try using it on my heat mech. I have no damn charge. I know about the quad core you talked about. I have no good torso to use for the eng mech, would have done long ago. But i used a platinum plating and a max protector as it has good stats though. I made my mechs earlier. Why do you say the solution is not to buff grim reaper? Don't you think i know this?  I know about windigo. I made it legendary as i had it epic. It was planned to mythical it. I will keep your mechs in mind, but for now, i am trying these mechs 
A
 
I am still stuck at rank 7 but these mechs are working. 
Oh by the way thanks. and i'm going to upgrade massive feets after modules and heat mech
i will try your mechs when i will have max desintegration.
 
i am waiting for an energy flamethrower