I think I would hang the fenders, bumpers, install windshield and take her for a few rides. Nothing like experiencing what you've built a little to give you some extra motivation for all the other assembly it still needs.
Southern Ontario doesn't have quite the same weather as California. There is a couple of feet of snow on the ground!!! I've had it up on blocks and run it through the gears up to 60-70 mph, so I know everything works OK - just didn't feel the wind in my face!!!
I'll have it done by spring and get it out on the road.O:)