RE: 1st time cowl cutting
Use your Dremel... and once you have a hole drilled out, use your tube sander not the disk. (Not sure what it's called.) Stay just inside your line and take your time. Don't run your Dremel full blast, just enough so your drum dosen't slow down too much while sanding.
It will give you better control. Once you have it sanded out, use a sanding stick and hand sand it to your line. Use a round Dowel and wrap Med grit Sand Paper tightly around it... and sand your curves with it.
Using you Sanding Drum reduces the chance of your Dremel getting away from you possibly screwing up your Cowel. Also it helps reduces the chance of chiping off your paint.
Luftwaffe Oberst
AMA District II
Radio Aero Modelers Club
Pulaski, NY
Supporter of RedNeck R/C- Fulton, NY