I don't recall ever hearing of a lampworker getting blown up. Meth makers though...whole different story
We get occasional burns, but very rare explosions of any sort.
10's fine.
It depends on what you're doing really. A k tank should last you 2-3 days if you're working 8 hours a day.
As for enough room....That's a little iffy. I think the rule of thumb (unless you're on one of the upper tier GTT's) is 3 feet depth minimum.