You know when i was young and a fan of MS series, i used to combine sprites of different units all the time, like it was building with legos. And well even as older person now and i still enjoy creating custom MS sprites like these ones i made on my spare time, figured i'd share them here aswell.
So these are from top left to bottom right:

Infernal Mech
Inferno Karn

Riot Troopers
Custom Iron Nokana