I've ordered some 8x14 or 8x12 plates to resolve it. I guess it's just the bigger models tend to have multiple layers and/or use technics. On an aside, my wife's build of the hp Castle is coming along nicely, but the tower doesn't seem overly stable. Wonder if they've made it flex so you don't destroy where it's attached. To the guy above, does your saturn sit in the sun?
Nope, it hasn't ever been in direct sunlight since it was first built.