We would create cardboard templates of the houses, and sometimes we would even give the houses stained glass windows (we found some sugar free sweets at the health food store for this, but any hard boiled sweet should work).
I have a recipe for you if you would like to try it. The recipe will work for a small ginger bread house, and may need support with a card fram underneath, as this recipe is geared towards nutrition rather than consturction.
To make it sturdier, replace the honey with goldensyrup.
Take your time, pop some festive music on, and enjoy.
GINGERBREAD RECIPE LINK