Step 4: Use EMT conduit to raise the handle bars enough to avoid contact with your knees when you peddle. Handle bars must be very rigidly attached to the front wheel. Any looseness will make steering difficult.
Combine an old BMX bicycle, wood, EMT conduit, and boat seat, to bicycle in laid-back comfort. Save $100's off the cost of a new recumbent bike.
Step 1: Use wood for a main beam across the top of the BMX bike frame. Wood is easy to work with, but does flex a little when you peddle.