Step 1: Buy a bike
Step 2: Start building
Remove the cranks. Cut out the seat tube in order to weld it on top of the frame to extend the seat tube so that the bike will fit a whole person.
Step 3: Extend the seat tube
Step 4: Seat tube gusset and main rack supports
Cut two pieces of square tubing to 56'' then clamp them to the sides of the bike frame.