So I am doing a IDW inspired Grimlock using a Beast Wars Transmetal Megatron. Now I was thinking of sculpting onto the Megatron head but I have no pratice or even touch any kind of sculpting material before. So that leaves a head swap. I have a classics Grimlock but at the moment he is M.I.A so the size comparison for that is up in the air. But the question is are there any other good alternatives? So far I'm leaning towards a alt Grimlock head it doesn't seem to be too big. And also it's well know that Megatron suffers from the Gold plastic rot that plagues a few figures. Is there anyway to slow or stop the degradation. Mine doesn't suffer from it yet, but I know it will eventually come and spraying coats of paint on it I'm sure isn't going to make a difference.