Come on Edarth, how many Batman body types has there been over the past 70 years...some buff and some lean. As long as his abs are tight and a standard muscular should work. I have seen some artist draw Bats just a buff as Superman as we all know Bats is no way that built. With the glossy green used on GLs of late, even a glossy black could be use. I personally wouldn't, it all depends does Wally2974 want to take his version of GL Bats...Classic or a more modern look? The bat emblem over the GL emblem is going to be the key part of the figure. Wally, what ideas do you have for that? Edarth, your idea sounds cool too!
What about a DC UNIVERSE SERIES 4 "GREEN LANTERN BATMAN BEYOND version ? Some awesome ideas could come out of that one! Any one up for a challenge?
Beside all of that Wally, take your idea and run with it. Use magnifying glasses that you can pick up at Dollar General for 5 bucks or less and SEE what you are painting. HUGE difference when it comes to details. Keep us update for sure!
Ps: Wait til ya see my custom Sinestro Corps Batman!