Wow! not posted here for a while...
Unfortunately, I have made very little progrss on this job (been very busy spinning my wheels and getting nowhere :shakehead )
I've taking the plunge and finally opened the maya dynamics toolset. Added a simple emitter to the centre chamber of the original room scene. The chamber itself is a collision object so the particles won't drift outside. Still have a lot of detail to add, just thought I'd post an update.
All suggestions most welcome...
(3.2Mb - right pick - save target as)
below is a screen shot for those who rather not download the vid..
"If you think you can or if you think you can't....... you're right!"
- Henry Ford.