Re: MN First time builder
Welcome to the forum. We're glad you've joined us here and we'll try to help you see your "dream" come true.
I've personally never built an OCC bike but there are plenty of them around built by our members.
You might want to utilize our 'Search' feature and type in Schwinn OCC. I guarantee you'll find plenty to read on that subject and it will probably answer many of your questions. I do know that there is a vendor who offers a custom off-set engine mount for the OCC and some other parts and pieces to make installing an engine much easier than hand fabricated parts. Not being a "gear head" purchasing some of those items might be easier for you than trying to make them yourself.
You have chosen a challenging project for your first motorized bicycle and we usually suggest you begin with something simpler to gain some experience and knowledge but we won't discourage ambition.
Good luck and let us know if we can help. Keep us posted on your progress.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"