i don't remember any issues/fixes it would need as itself. if only you maybe want to turn it into P1, then you need extra parts either from old P1 or from GermanBeast: shoulder guard, spine bone trophy, necklace bones, right hip guard (i don't remember if he made them, the one on HT predator misses a round part on its end), leather straps for elbows and knees.
some people also paint golden rings on his head.
some master painters even repainted his armor, but it's a rarely done, super tough work.
his head, face, armor, feet and hands sculpts differ a lot from P1, but nobody actually pays attention because there is no achievable way out of that.
as a whole, it's almost the best HT predator figure, second only to their own P2 Greyback figure, and only because of a more accurate headsculpt on that one.