I shouldn't let that Big Robots AU to get you down. Although now it's making me think of Big Guy and Rusty, stupid late 90s shows that only had two seasons and were wonderful. You already had something wonderful-maybe if you can't come up with anything, you should farm out the Big Robots to other interested persons? What you've got there already is quite enough. At least, for me it is.

Fair warning though, keep going and I might make up one of those factsheets for your mechs. Did you know that a Warhammer is a classic design from the Battletech universe? Sadly, it has no hammer at all. Yours is unquestionably superior.