I just started the same kit - half scale van buren - and my pieces have a lot of warping, too. I think it's from the kit being shrink-wrapped - that's what seems to have caused the warping. I'm wondering why Greenleaf packages it that way. Why not put it in a box? The other thing is, the directions are a bit wonky. Tells me to take different window pieces from the plastic sheet, but all I have are plain sheets of plastic that need to be cut. I don't mind that, but the directions should match the kit, I think. I'm hoping that gluing and clamping will fix most of the warping issue.