The GBC frontlight kits aren't that great. It looks terrible unless you adhere the screen to the lightbox layer (or whatever it's called) using LOCA, like on a cellphone. Backlight looks much better than frontlights as a rule, anyways so I'd personally go with that.
I'd swap the analog and dpad/buttons layout. It looks too low and uncomfortable how it is now, and with a raspi2 most of the games you will be able to play well you'd probably use those more over the analog.
Also I'm not sure what's to the sides of the screen but if those are speakers it would...