Had a call this evening from oldbob; really nice man with a lot of experience with the booth I initiated this thread with. He's shot many different items, not just trains. But since I'm only interested in F3's and 15" passenger cars, he confirmed that the booth would be fine for my purposes as he had done virtually identical painting.
As for filter replacement, he said rattle can paints tend to use up the filter faster than airbrushed paint. He usually uses one filter at a time, and they can be reused since much of what the filter collects can be removed--sort of like cleaning a rug outside. He stressed that keeping the booth clean by wiping it with a moist shop towel was essential after filter changes.
He bought a "Masters" labeled spray booth on Amazon. Visually and spec-wise it appears to be identical to that offered on ebay w/o the "Masters" name. At his suggestion I looked at the Masters version. It was priced about $20 or so more than the ebay version.
There are numerous ebay vendors of this booth. I bought this tonight:
http://www.ebay.com/itm/201101...e=STRK%3AMEBIDX%3AIT
$73.95, shipping included, suits me fine. As mentioned in an earlier post in this thread, if the unit is too small (and I consider this to be unlikely after talking to oldbob this evening) I can order a second unit and pair them for a much larger working space.
It will be awhile before I use the booth. There are 6 or 7 passenger cars and two F3 A unit cabs to strip.
Thanks, again, for all the replies--lots of good ideas, including in the video clip posted above. I'll no doubt post on this booth once I actually use it.