There is a member on the Spirit forum who built one from scratch. His screen name is: Rotten. Perhaps you could ask him for advice. You'll need to join their site to PM him. He has pics in the Gallery there.
mine is all steel as well.
First I built a 'cardboard' body to get the proportions right.
Then a 3/4 light gauge box frame and skin'd it with 18gauge steel, hand bent the bulkhead and made a tube frame for the roof nad covered that to look like a canvas roof.
all up cost was around 200 sorry $400 to you...
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