The CG 330 is an ARF and therefore ought to come out of the box in pretty good shape. If you are really concerned about the warp, send that thing back to the seller. I just put together an Ex-treme 330 about three weeks ago and was very pleased with the construction; everything was straight as an arrow. If you are not happy with it, call CG directly if the seller won't give you a replacement.

Good luck and the thing flies like a banshee!

Dan