Drilled the hinge to the fab upper plate and taped on paper template. After several itterations of on and off and trimming, I worked up to card stock and finally 032 aluminum. Its not perfect fit around the edges when closed but I have a plan to help close it off better.
Drilled the top scat flange to the top plate. The door opening is wider than the flange and I dont know if I should fab sides to close off or just leave as is. I think it would perform better for deicing if closed off but could also get too hot without venting out the sides some. Also, when not using the he carb heat function, The hot air from the muff needs to go somewhere if not into the fab. Ill check some more on this but I have a feeling it needs to vent into the cowling.
Made a spacer out of 032 stock for under the door side of hinge per plans