Ok in pic 1 you can see I have glued a 2in piece of 1/8 lite ply and tied the front and back formers together this serves several perposes.
1 beefs up this area of the fusealage
2 gives the fiberglass strength for the wing tube to pass through
I cut and glued one on each side .
Pic 2 and 3 showes the removeable firewall that will be screwed to the firewall ring with I blind nuts and screws
pic 4 showes the area where the wing tube will go .
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