I was inspired by this bike which is much more beautiful than the one I built. I built the bike in Haiti, with a minimum number of tools and ingredients. I would have posted this a couple months ago, but was delayed because as I was taping the stencil on the frame, Haiti was struck by 7.3 magnitude earthquake. Costs for this bike were $25 for the bike, about $10 for steel, and $5 for welding rods. With the seat tube change the frame is 17'' tall, I'm 6'2'' and it's not uncomfortable to ride and a friend who is about 5'6'' took a 20 mile ride on it recently and fared okay.
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.