i used micro balloons on my joints in the corners with epoxy. the first glue up.....i didnt use ballons. i grabbed the tail section and gave it the torture test.....the stab broke free. so i added some 45 degree gussets on the inside....mixed up a batch of 30 minute with balloons....let it cure overnight. gave it the same torture test....i couldnt break it free. and i also used the 45 degree strips per plans on the outside bottom/fuse /stab junction....only i drilled small holes with a pin vise in both surfaces before i epoxied them in. i feel this is as strong as the surrounding wood holding the structure together. you could over kill this area to your hearts content, but wont gain anymore than the wood will hold itself!