Sorry to hear about your problems with the Stagger Bee. When I did mine last year, the die cut play was in pretty sorry shape, both uncut and seriously warped. One thing that helped is that the most warped pieces were usually doubled against a matchin piece. This let me glue them together with warps going the opposite direction, and when weighted down to dry, I came up with nice flat doubled pieces.

You'll have to send a picture of your Bee when its covered.