The frame

Nine months of planning, design and experimenting got me nowhere. One saturday afternoon at Walmart and about $85 got me so far down the road it wasn't funny. I purchased two identical 20" BMX boys bikes with full suspension. These made up the majority of the frame. The next part was connecting the two frames. This was achieved with 3/4" thin walled square tubing. We designed a seat base then re-enforce the edges with round bar. We then welded hinges to the seat and bolted them to the frame.