Welcome decedent, I built a schwinn occ a while back. There are a few snags you will run into. You said you have your motor mounted, did you use one of Barry's mounts or make your own?
Since the motor needs to be set off center about 3/4" it is so much easier to use one of Manic Mechanics rear sprocket adaptors. That way you can move it from side to side to get the clearance you need to clear your 4 1/4" rear tire.
Also you will have to fabricate your own exhaust or buy Barry's pipe off e-bay.
Then there is the chain tensioner issues. You will probably have to use a revised tensioner mounted on the top of your chain in the back. You will also have to modify your left rear brake pad to clear the chain unless you go to a disk brake.
They are not the most fun build, but I am fortunate to have a mini Machine Shop to build parts.
If you get stumped on somethiong feel free to shoot me a privat message. I will give you my phone number and help you with some parts.
I have another OCC bike ready for another motor, I am trying to hold off till winter.
John