Minesweeper: Nothing really wrong with it, I am guessing the scoop is like the one on behemoth which is a good idea. The only remark I have there, is why not make the entire robot of the same armour? give it 4 or 6 mm Hardox all round instead of that mish-mash of various types of armour. In real life we want to keep the amount of materials down as well, from a maintenance and repair point of view.

Roveress: make it a little bit wider, like 70cm, and I think it is in good shape. For the srimech a lem130 is way overkill though, just make the robots top a bit rounded so it rolls over easily and use a Bosh with a gearbox to power the arm, it saves on batterypower and is much more sensible.

Cyrilium Mach 3 : Make the robot higher. There is no way in those dimensions that you can fit 2 2kg bottles, pneumatics, lifter and axe mechanism, and 4 magmotors and batteries.

I must say your stats are improving though, keep it up.