The model was built to specs no extra any thing. Then the entire model was glassed with .58 oz cloth with polyester resin. Primed one coat and rattle can painted Krylon I believe. The paint is not like glass. But it is in color. It has an alum. main gear,bvm wheels and brakes and a strut frnt gear. Standard radio gear. With a Simjet 1700 for power and a two liter pop bottle for fuel. Thats about it. I really dont know why it is so light. It just is.
I must say it really floats. The residual thrust at Idle is almost too much to land. We turn the rudders outward for speed brakes on landing This works good.
Thanks For the questions.

Hooked.

If any one is interested We are building them as an arf just add radio gear and turbine for around 850.00 depending on covering options.