Welcome to BVEStation.
That rust looks AMAZING! It would be more realistic for a post-GOH model though, since as a pre-GOH model it would normally be in better condition back then than it is now.
Maybe in the beginning, but not nesscarilly, here's the picture i used for the textures.
At 03:11 and 04:12 - remember to update the wall textures
Remember, it's a beta. It's not finished yet.