[python] mounting rear wheel to seat

I was contemplating various designs, and came up with a question. If I were to 
build a metal seat, similar to Nobuo's or maybe a Challenge seat, could I mount 
the rear wheel directly to the seat, without any other sort of "body" tubing? 
In other words, could I attach the rear triangle/ wheel arms directly to the 
seat near the shoulders area (probably by welding, maybe with bolts)? This 
would require that the front pivot piece be directly attached to the seat as 
well.
   
  Would a metal seat be strong enough to act as the main body of a bike? Do you 
think it would stand up to the laterial and... um, "twisting" torque of normal 
riding? Would there be any special considers with building such a seat? 
   
  Such a design seems like it would save some weight.
   
  Thanks!
   


--Timothy Walters Kleinert
                
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