I'm pretty sure that it is around the same size as a lambda shuttle, maybe slightly smaller, but not much. I don't think that a rack would work well for this shuttle, and the landing gear would have to be extremely long to extend past the wingtips. Maybe the wings do fold, maybe there is a secret seam in the side that you can't see that allows the wings to fold. Or...maybe the wings fold like the F-18s, not at the base of the wings, but somewhere along the lengths of the wings, they bend upwards to allow the landing gear to touch the ground.
I'm not sure about any of this as the model on the first page of this post is the only high detail model that I have ever seen. The ones in X-Wing are maybe 100 polys.