Hi Tony. Built the Sky 40 (electric version) and so as I am a learner got my club mates to try it out. All VERY impressed,also congrats on your thoughtfull design work in angleing the nosewheel forward. From experience this is a weak point on many trainers. Could you help though.. If I built a second one, will it take a 4 stroke ic motor and what size can I use. Yours Norman.