HG,
The insulation (4'X25' for $40) is from home depot and the felt ($6 per yard (6' wide) but got it on sale for $3) is from Joanne's fabric store.
Next to the insulation is some aluminum tape ($3.57 a roll).
Some general purpose 3M spray adhesive ($5.50) sprayed on just the aluminum insulation and then stick the felt to it. OK if some wrinkles in felt, inside and still functional in protecting the wings).
Also, made protectors for the horizontal and vertical stab.
I make my guns screw on so they are removed during transit.
If your guns are permanent, guessing you could make the bags larger or make the front the open end.
The P-47 is probably the only one to worry about guns as other warbird guns are usually recessed or near so.
