Re: building bikes for other people
Running a business involves a lot more than just building bikes. To be successful at it you must advertise. You're then held accountable for what you put in your ads. Therefore one should be insured and bonded. Avoid using phrases like "Street Legal" as the laws vary greatly from state to state and country to country.
Still customers will be wanting to know if your product can be used legally on the public roadways in their area. So you should become familiar with the laws of the areas you plan to sell to.
You'll also need some bookkeeping and basic accounting skills. Therefore I suggest taking some business courses. I've got a bachelors of science degree in business. I hope this helps. One can lose everything if they don't know how to operate a business.
Land Rider Jerry