Hey,

I really like your current options, but I think an early game spidertron with fast moving speed for scouting and transportation is missing.
Maybe you could add a spidertron without weapons, inventory and grid and low HP, but with a moving speed comparable to the car.
What do you think?

I kinda don't want to add even earlier tier and I am probably going to add 1 or 2 more trons and call it a final content update. I don't want to make mod too big for it's purpose.

I am going to add utility spidertron though, but it will be of chemical packs tier at the least

Maybe early game was the wrong word.
My intention was more in the direction of faster as vanilla spidertron and earlier in the research tree, but not no defense and attack as a trade-off for fast movement speed.
But I understand where you are coming from in regards of the mod getting to big.

I would say to either apply that to the Pentatron (which I'd prefer as the shotguns do nothing, I'd rather have it move 25 - 50% faster and have no weapons), or make a new one in the same tier (maybe costing a bit more).