Sorry I was so slow to respond. Kept forgetting once I got home. Have you any need for firewall recess measurements, and a plan to deal with that feature?
I did mine in SS foil over FibreFrax. A cardboard template fitted in place made the conceptualizing and cutting jobs much easier.
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug