Neat. The guy clearly has a lot of imagination. His construction skills seem to be rudimentary, as if the only tool he owns is a hacksaw, but he tried hard.
However, I must admit that I couldn't stop cringing throughout the video. The mix of ARAH and modern Joes, the weird mish-mash of parts (Buzzer's lower half with Cutter's torso???), Grunt with Breaker's gear driving the MOBAT, the canopyless Skystriker, Slipstream and Wild Bill being ground-level heavy gun operators, etc.
My imagination can suspend disbelief to a degree, but the randomness and complete ignorance (or intentional disregard) of the characters' roles/specialties makes my OCD scream.
But I give the guy props for the imagination and all the work he clearly put into it.