Psyco

In most ARF kits they suggest using cardboard for marking muffler, needle valve positions to transfer to your fibreglass cowl as a guide for making your cuts. Try using thin mylar, then you can see exactly where the needle valve etceteras exactly is, no guessing.... I use old/used overhead projection mylar, free and works the best!

Len

platero

Nice idea and for cut those cowls atach a exacto blade to a soldering iron with some wire, when the blade is heat will cut the plastic like buttler, try it