About this detail of the Tiger
The Dragon hull is deliberately warped. The edges of the side walls are supposed to line up with the roof plate. Here you can see the amount of warping.
When all is glued, the rear plate will hold the back of the hull in the correct shape. But the warp is stronger at the front, and there is nothing here to force the hull apart. I cut a length of brass angle to the correct length, as you can see here. A length of sprue would work just as well.