Hey Airdale,

Built the cowl from the three parts. Fit it to the plane with the engine. Then get some medium weight fibreglass cloth and ZPoxy finishing resin. Roughen the inside of the cowl with sandpaper and put two layers of cloth in convenient pieces covering the complete inside of the cowl.

It's a fun project and has worked well for me. If you bust up that cowl in a crash you can replace it with a fibreglass one.

Bob