What do you do after you built a motorcycle part by part?

Im planning on building a honda cb100 part by part,why?, well because a full bike is too hard to find in my state and are usuall found in the east i dont really want to deal with shipping it and trusting the seller, i just want to know what to do after i bought all my parts from ebay, salvage yards, friends, random people. How do i go about licensing it exactly, if its to much work please let me know. Its not technically a custom motorcycle but in a way i guess it is because im building it from scratch.

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