PROS!
Would literally revive the game.
ENDLESS ways for creative gameplay features!
Really cool workshop tab!

Cons?
NONEXISTENT LADS!

Basically, with the Mindspace Designer being a thing, this now becomes possible.
All we need to do is select the bot's AI, their upgrades, and finally the parts to make the model.

It's a real simple idea Doborog. Just let us pick each limb separately, and a TON of problems would be solved. Aaaaaaaaand of course we can make a competition out of it! A competition where each participant gets 3 submissions of endless levels, (in the form of challenges of course!), to help build a new challenge coined the "Custom Enemies Challenge."
Trophy.
And for the Co-Op variant, you unlock a custom skin option!