yeah, building up a bike is really more for the experience than the price. Make sure when you tape the rims to use a clothe tape like velox, not rubber. Rubber won't hold against the tube well with double wall rims. I would also suggest not moving spacers from one side of the hub to the other, like baxtefer said. I'd put the spacers back like they were, and see if you can take it to a bike shop and get a different bottom bracket, because if you move spacers it will throw off the chainline twice as bad if you ever flip the hub.