I recommend you start with a unicycle first.
Less than 1/2 the effort.
Evaluate if you wish to more than double your time for a bicycle that's uncomfortable.to ride.
How long will it take to make a chain?
Will the frame be wood? Or are you going to roll&seam tubes?
Assuming this is a fixie?
Remember, the 2nd man to invent the wheel was stealing intellectual property.
Final question: What, no bike co-ops nearby that could greatly use your time and skills? For a truly productive result.
Good luck with your project. A recumbent might be easier, if your chain making isn't too time consuming. Maybe front wheel drive?
edit: searching revealed a follow-on project.