That is odd that your friend's square body had orange. The green is actually kinda cool, my dad's square body has green interior, for the life of me I can't find a picture of one online, so it must not have been a real common color, almost rare. I thought about making a GMT400 interior green like the square body's, but it would be a lot of work, mostly time consuming. Just checked on the Corvette interiors are you are right, only the seats are red and the rest is black with red stitching/accents.