I had a king kong knock off body, was gonna make a random spare parts figure, but after I attached the goofy head I thought, optimus primal, then because id just made primal I thought no, ultra magnus (usually a prime repaint by hasbro to save money).

A few bits of fodder on the head, a bionicle chest plate painted blue. some lego parts for a gun and bionicle flexi stuff into cogs on the shoulder, kong was dry brushed white to look like a silverback (LOL he finally outranks prime by gorrilla social habits) the head was painted white and blue.
Took a whole of 10 minutes, easy.

Heres a random factoid. I like to make spare parts figures with left overs because
A. I can find bits for future customs later
B. sometimes you end up with something as cool as this by default
I dub thee "spare parts mk3" (or beast wars ultra magnus)