yeah, if it was painted on the inside, it might look pretty cool (nice and glossy black).
Also, on the plexi glue, I remember reading somewhere that you can make your own acrylic glue by mashing up some pieces of plexi and acetone. I think it may have been that mini bartop that someone made out of plexi where I read that, not sure. I have thought about trying it though (I don't know if they really ground it up in a blender or something, but if I remember right, they at least broke the plexi into small pieces, mixed a bit of acetone into it and it all melted together eventually and made a great plexi glue/cement).