This is called the Flight Assistant, built by me in 2,000 from AMA plan # 520, it has been in Va., Md, Pa, Ohio W.Va. and South Carolina. I still have the plans because I didn't use them as intended. You were supposed to tack glue them to the wood, then cut out the pieces, I used a couple of squares and simply drew the lines on the wood and then cut them out on a 10" table saw. I have been seriously thinking about building another.