Yes, I always centerstand my bikes while kick starting them. Side stand kick starting is awkward at best and sometimes the bike floods because of the carb angles. Kick starting with no stand is, well, you found out, lol.
Kicking may a bit more stable if you leave it on the center stand.
steve.... breathe.... it will all work out, im racing around trying to fix what blew off my paint racks in the wind...
I just checked it. That appears to be the bike that belonged to -jwk-. I don't know a machine better documented on the internet than that one. I've been following it for many years!
do you have a link?
Chase ALL the threads on ALL the bolts ad nuts before reassembly. Please, please do this. Also, it's looking pretty good so far!