Attempt #1 and #2.............................
#1.........First I did cut away the indicated part of the fuselage,
the two pieces in lower part of photo. Then tried a Kindig trick
of spanning the opening with several layers of tape........
Then cut the replacement sheet template out.
Attached that to a piece of .75mm, then tried .5mm and .25mm
styrene. None worked. Just couldn't get it to keep its shape.
#2. Then a new tac, line the opening with card stock.
cover with industrial paint tape. and Then.........
fill with air dry clay. I'll let this set and
try using it as a mold and pull some heated
styrene over it. Couple days drying time!
What I go thru, arrrrrrrrrrrgh