I'm a championship level googler- I should quit my day job as a programmer and just google things for people. You're welcome!
And I'm jealous, by the way, I want antique gingerbread house molds!
To the rescue:
This page shows a how to step by step towards the bottom of the page:
http://www.recipetips.com/kitchen-tips/t--1332/how-to-make-a-gingerbread-house.asp
And this one has some tips:
http://www.wisegeek.com/what-is-a-gingerbread-house-mold.htm
I'd do a couple test runs with some...