On your "rotatable device", make sure it:
1. Doesn't block any airflow underneath the device, (ie, Don't use a Lazy Susan to sit your kit on while you paint.) and
2. Doesn't suspend your kit above the level of the surface that it would normally sit on (where vapor capture occurs).
As good as downdraft booths are, they can be easily compromised in terms of airflow, capture, etc. I can remember when we used to paint F14 aircraft (1:1 scale) on a rather large downdraft system, and simply painting the tops of the wings and fuselage blocked the airflow enough to cause vapor and particulate rebound, and completely eliminate any immediate capture ability in the system. Granted, the variables are different, but the concept/theory still remains.
By the way, congrats on quitting smoking ; I hope your withdrawal goes smoothly. I remember my dad was a 3 pack/day Lucky Strike (filterless) smoker who quit cold turkey one night, and he didn't have the benefit of any of the non-smoking aids that are available now. For about 6-8 weeks he was a bear to live with before calming down and re-discovering food (I think it started tasting better); consequently, his weight went up. But I digress...
All the best in your efforts!
Gip Winecoff