You raise a really good point, actually. Here's the method I'm going to use:

1. Export Michael or Victoria base from Poser.

2. Import into 3DS Max at vertex scale 100.0. The Poser preset does not work whatsoever.

3. Use the scale tool to reduce the figure down to about 30%.

4. Build home...building or whatever geometry I think of.

5. Scale back up to 70%.

6. Export the geometry I built at vertex scale 0.01.

This should work just fine, and will probably serve as a great measure for future model building. Not that I'm ungrateful for the help you've all given me in this thread, but the whole numbers game can only produce inaccuracies and confusion.

Thanks again.