Laying the part in a positive form with enough epoxy.
Made an instrument panel for an older French Jodel this way, and it turned out pretty good, though not the lightest.
- ain't the Destination, but the Journey -
RV-6.9 #25685, slider, O-360-A3A (carb/dual Lightspeed II), MTV-12-B, HB-YLL owner & lover
RV-4 #2062 HB-YVZ airframe builder