This Model will load as one full piece. Create 2 build plates and copy the tank to build plate 2, go to object tag then delete all but part 1, you will then have the base to print. On the first build plate delete part 1 from your first plate and color the tank as you would like. I have seperated all piece into parts, you can ether color each part or use the bucket fill fature to color that parts as you wish, but if you use the bucket fill make sure to color both sides so the color goes all the way through.