If you can get it around 16-18 lbs. your good. That is race ready less fuel. I am building the U-95. It currently is just under 9 lbs with out decks,wing or cowl. That is with radio,pipe,header,Zenoah engine,all hardware and a 16 oz. fuel tank. It will probably be around 16 when done. I have the 1955 Tempo VII with stock zen power. It is a glass hull that's 20 lbs. Runs 56 on gps. Can't wait to run her with a Mod in her.