I have started making the cowl for the plane.* the most difficult part was making sure everything would fit under the cowl.* I took a long time to locate the water and oil radiators, I hope it works.*
The plug is made of purple foam from Home Depot.* I cut it with a hot wire tool I made with piano wire and a rheostat .* I have seen people use a battery charger t run a hot wire but I have not tried.
I have learned that not all spray adhesive works with foam, some eat it.* So check the can.* I also used Tite Bond PVA (wood glue) it works but needs to be clamped.* I also used construction adhesive when the gaps were large.
It was shaped with hand tools like a rasp, file and a lot of sand paper glued to different shapes.
the finish filler is Durabond 90. It is a drywall compound that chemically activates and sets fast and is very hard.*
If you use it remember it sets HARD and what goes on must come off.
I have done a lot of reading on other posts and would like to thank all who took the time to help a new guy.