I used a cutoff wheel in a die grinder, or my large dremel to rough cut. Then I sanded down to the line, or where I figured it needed to be with my hand-held belt sander with an 80 grit belt. Be careful, it goes fast. Use a mask and goggles, and go outside to do it - its dusty. You will get it close to where you want in just a few minutes, then slowly close in on the fit youíre looking for by hand with sanding blocks. Take your time and go slowly, and donít worry..... any mistake you make can be fixed with epoxy/cloth/flox.
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2019 Flying