definatly the CA jigsaw puzzle trick works well another idea is go to the LHS(local hobby shop)and get a new piece of sheeting, and a piece of 1/4 stock(small strip of balsa)and cut the sheeting back to where its not broken at a former or support.
then take your old pieces and glue them together so you have a template and make some new parts the broken area doesn't look that bad,as I recall,its been a while since I have seen a Funtanna in person there pretty lighty built so replacing the sheeting might keep the weight off.
then use the 1/4 stock to replace any broken stringers there may be more in the dammaged area but it doesn't look like it from the photos.
it sounds more involved than it is,pretty simple really and you won't have much in the way of doubled balsa and glue adding any extra weight,+ if your flying 3-D you will be fixing it more, better get used to rebuilding it
