I understand what you are saying, venturing into the unknown is very difficult so I will give you "some" advice, however these are just "simple" advice (from my experiences, it is therefore not global) therefore surely not to be used for high level constructions, also to know i'm just only r11 ( on my secondary account ) so my advice is not reliable :
stats adviced
energy Regeneration/cooling average stats adviced : ~330
energy cap/ heat cap average adviced : ~610
Hp minimum stats adviced : ~2500
Resist : you can use matrix, that very decent but use the 3 different forteress is better .
About weapon synergize
I see that you have paired 2 type of mech, the hugger and the scope but it is generally advisable to specialize in a specific range but that is not a reason not to put a melee weapon on a mech that attacks at long distance.
Other
The torso is perfect, there is not better. Same for the legs, the massive is the best legs for so many build .
The drone.. there is no better, that very good
The combo Heronmark+ terrorblade is literally a set of weapon ( with space invader or red rain) used for one of the best builds in the game (currently): heat hugger, I advise you to keep this .
Because from the lack of use of the distance controller it is advisable not to use it, perhaps replacing an basalt armor dissolver ( maybe use the broken version ) instead.
In truth for your first construction it's really not bad