It is built well but light. I ran some epoxy around the firewall joint just for my peace of mind. Probably wasn't necessary. The balsa is soft and easy to cut with a knife. The ribs are all skeletonized. The wingtips and cowl are of fiberglas instead of ABS. All surfaces are already cut/ slit for hinges, but you have to glue them on. Wing is thin and symetrical. I didn't use any aftermarket control horns. The stock ones seem to be fine for a forty size airframe. It has to be well-built or I would have broke it in half this afternoon. I have too much elevator throw and it really turns tight(as on a dime). I held the stick forward and let it do about 5 outside loops in a row but at about half throttle to unload it a little. I am in the next to bottom hole on the horn. May move all the way out or maybe in one on the servo. I tried to fit a Saito 56 but it stuck out of the cowl too far and looked funny. Any motor heavier than the TT GP 42 will have to have the battery moved back. Probably weighs less than 5lbs. Haven't weighed it, but it is light. Went to 2.5in wheels, but it still noses over trying taxi on grass. Rolls out a little better, but noses over as soon as it slows on landing. Next step is to change to 40 aluminum gear(not wire) and take the rake out of the gear. The rake looks good but isn't practical unless you like carrying it and having someone hold it for a full throttle/ full up elevator takeoff Turtle deck is foam not wood. Over all it is a fun, fast and certainly not boring airplane.