Nothing wrong with Echo 1 metal externals. They're not the best out there, but they're tougher than the plastic body on the G&G. So I don't see what the problem is. If one can get better, than it's always recommended. But IMO, there's nothign wrong with that body. Hell, my DBoys C8 body has seen a lot of action and taken some serious abuse and has no problems anywhere. As far as I'm concerned, Echo 1 make higher quality bodies than DBoys.
BTW, you never mentioned one way or another, but if it's one of the G&G Blowback models, standard bodies won't work. as the inside of the upper is slightly different to accomodate the modified V2 mechbox and the blowback mechanism. If it's a standard G&G, then yeah, it should fit fine.
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