Three years or more you will lose money and still need to support the family. Even with %150 mark up most bussinesses make about 5% to 10%. Don't guess. Make a good accurate list of every little part needed for one frame. Even paint, welding rods etc. You will need good market research to show what
people will buy. Market research is very important, know what all the other frame makers are selling. Make sure there are plenty of customers at the price you need to sell a frame at.

Untill you have at least a three year bussiness plan with all these details you won't know what anything will cost. The lack of the above information is why most small bussinesses fail. You can make the best frames in the world, that does not mean you will make money. Even a patent does not insure profit.
Don't forget that you need to buy inventory to get started. You need to buy many things in bulk to get a decent price. Call now and get answers first. You need to pay taxes on inventory. All the pieces of the puzzle need to work to make money. Not just a good frame.
If you get all the information together you probably will be very dissapointed. Maybe not, I don't know anything about your plans, or your finances. Even doing it as a hobby
will cost a lot more than you think.
After including the labor cost, make sure you add on the profit, not just your labor.