Yes you can take clones durring flowering, but it takes a few weeks more for the flowers to die back and new shoots to grow. Doing it that way has a higher degree of difficulty. But you can pick your best girl, and clone that, vs a more random pick.

If you mean by "maintaining" your clones you can't keep them cut, but not planted, for any length of time.

The idea about building a seperate space is the way to go. It never hurts to have some extra room. CFL's are cheap and fine for veging. And you don't need much room for a single mom.

And I think your Hawaiian Snow is a sativa, and will probably take a little longer than 8 weeks.

Good Luck.