Good review.

There is a 5mm port on Devastator's butt you can plug Rampage's base plate into (yes I know). It hides the tines better.

I am one Overload short of completing him myself. I have 7 connected parts sitting right next to me as a type, grinning.

If you poke around online there are a few good options for angling Mixmaster up to allow a crouched position. The biggest issue then is accepting that there are no knees and you will probably have to rely on bending at the waist rather than the ankles to go on all fours.