Howdy Sam, welcome.
Your bike looks great.
I agree, these really are a great and fun way to learn wrenching and the folks here are awesome. Always ready to lend a hand with information and support. If ya get a chance, try to make one of the rallys or group rides. Really fun and amazing how much information ya can pick up. If none are set up near ya, just post in the events section.
If I may be so bold, I find knobby tires add vibration but some folks prefer em. Personal choice thing.
Have you seen the classic instruction section? Classic Instructions for Building and Repairing Motorized Bicycle Engine Kits - Motorized Bicycle: Engine Kit Forum
Big time help if ya get stuck on any thing.
Again welcome. Ride safe and post lots of pics!