Since you're not airbrushing or otherwise spraying paints, it sounds to me like the vapors you are generating are more of an annoyance than an exposure problem. Therefore, there are some simple things you can do to help alleviate the problem.
1. Substitiute the products you are using for some less "smelly" materials. For example, Ambroid cement contains methylene chloride and evaporates considerably faster than Testor's liquid cement that contains MEK. By using Testor's over Tamiya, Ambroid, or Tenax, you stand to reduce evaporation rates, and therefore vapor concentrations in your breathing zone. If paint is an issue, look at brushing acrylics instead of enamels or lacquers.
2. This one's behavior-based: Put the tops back on the containers as soon as you finish using them. Don't leave them open to air. In addition, look at how you are applying your materials. For example, applying putty in small quanitities with a toothpick is better than glopping it on with a putty knife. Apply glues with a small paint brush (a 1/0 round sable is great for this).
3. Empty your trash can regularly, and clean your workspace. Solvent or paint-soaked rags or paper towels can add to the vapor load in your space.
4. Put a small room fan in your basement with the fan pointed toward your back, and leave the door open. Assuming a small frequency and duration of materials usage, the use of a fan to provide dilution ventilation should reduce the smell to an acceptable level, or even reduce it altogether. Putting the fan at your back, or slightly to the side will blow generated vapors away from your breathing zone.
5. Finally, I would give serious consideration to moving your modeling location to a non-enclosed area. As an example, I've been trying to prepare for a show, and am trying to hammer out a howitzer at the kitchen table. I'll airbrush in a back bedroom where I can turn on a couple fans and open a window.
Hope this helps. Keep us posted on your efforts.
Gip Winecoff