Skyking,
Wait for the gear and bigger wheels, you will be glad you did. The stockers are just to small for anything but pavement.
As far as the warped elevator, no problem with mine at all. As a matter of fact it seems odd it would warp being sheeted foam, but I suppose stranger thing have happened. It is doubtful you will be able to get it out being sheeted foam, unless someone has a trick.
tim