Ideas for this situation?

Get a good respirator, and a half-decent fan. Open the window, position yourself so that the model you're painting is between the open window and the fan and try that. Spray booths can be very complex to handle lacquers, or very simple to deal with acrylics. Acrylic paints are less toxic than enamels and lacquers, but inhaling dried bits of plastic still isn't good. The paper or cloth masks are pretty well useless, and should only be used while playing "Doctor" with the missus!

Here's a tutorial on making a very basic spraybooth. It's pretty easy!

http://www.briansmodelcars.com/tutorials/tutorial/65

I've seen a similar one where the guy was using a translucent plastic box, but darned if I can't find it! I know I've posted it somewhere on the FSM forums, but I'm not searching through over 4000 posts!

That'll make the wife happy. They say they always want to be included...

Back that puppy up to an open window and the fumes can go outside to play!

Acrylics only! Preferably those that can be thinned with distilled or deionized water for spraying, such as Polly Scale.

Organic vapor respirator. All acrylic hobby paints contain some organic compounds that you don't want to breathe.

Get a breeze-box type fan, and move the painting portion of your build temporarily to a room with a window. All you really need is a reasonably stable surface like a tray table in front of the window with the breeze box in it. 

Ben, if you're planning to airbrush in a room that literally has no windows and no way to vent to outside, I would backtrack from my earlier post on your other thread and second Ross's acrylics only advice.  Even at that, it sounds a miserable environment in which to airbrush.

Andy 

Can you spray somewhere else in the house?  For instance, you can take a box fan, tape a furnace filter to the front, put the fan in a window blowing outside and spray in front of it.  Stay with acrylics.  Put a drop cloth down to catch overspray.  Spray a little at a time, maybe only 15 minutes.

Jesse