Hey Cam welcome to the forum... Seriously consider getting a Shimano CBE-110 rear hub with a coaster brake as it is the most standard size that will accept a sprocket adapter and eliminate the rag joint for the factory supplied sprocket that came in your kit. The sprocket adapters are a little pricey but allow the rear sprocket to easily changed for different riding conditions and run far more true as well as easier to get aligned properly than the stock rag joints are. Then run a center pull front brake or disc on the front if you dont have one already.
Here is a link to the adapters that Sports Car Pat sells which I think are superior to any other on the market:
Anodized Sprocket Adapters