The only thing I modified here is his head. I extended his neck and painted the faceplate a bit -- the intent was to give off the illusion that the white space was smaller, since it's far too large on the kit.
Alright, it was just a friendly reminder. If you really want a good exia, you should shoot for the Metal Build. Aside from the joints loosening over time because they're metal, the figure is absolutely fantastic.
Err, I forgot about heavyarms. In order: Shining Gundam, Exia, Strike Gundam, Heavyarms... there's probably some I'm forgetting about, but oh well. I own more Exia's than any other suit, though. The MG, HG, 1/100 NG, SCM ex, SHCM Pro, Robot Damashii, Fix Figuration, and the MSIA.