In short, I've started building an airliner (Eastern Express 737-300, to be precise). Both fuselage halves are slightly warped, but just enough to not fit together properly. I've tried heating them in hot water, then holding firmly in the 'straight' position, and cooling them in cold water to lock the shape, as was recommended on another site. It seems the plastic is too firm/resilient, as precisely nothing has changed. Any suggestions on how to fix the problem?