Just an idea here, but what about changing the arm glove parts so that they're not the same as on the voyager Megatron, and what about finding something different for one side of his chest pieces? I mean, the arm pieces could even be cut from something that you like on the front of the alt mode, and you don't even see the chest in alt mode, so maybe it could play off some kind of asymmetrical angle? Maybe this Galvatron broke away part way through the reformatting or something? Nothing against what you have as it is (I especially like the warn paint job), but you mentioned having it not turn out exactly like how you wanted, and since I generally consider any sort of work of mine to be unfinished as long as I'm alive, I figured I'd mention a couple of things that came to mind.
aahhhh I like your ideas , I wanted to change the chest piece but couldn't find the right add on part for it so I left it alone, as for the arms I never thought about it, so since this piece is gone now to its new owner, I will try your idea on the second one I work on, so thank you for the great input.