Many gingerbread house patterns can be found online. Possible dimensions to use are: 11-1/2x6-1/2 inches for the roof; 10x5 inches for the side walls; 5x5x5 inches for the angled wall.
Substitute margarine (sticks, not spread) for the butter if desired.
Instead of using royal icing as the "glue," you can heat 2 cups white sugar in a large skillet over very low heat until melted. Carefully dip gingerbread pieces in the syrup, being careful to avoid contact with it as it is very hot and sticky. The syrup cools immediately and is unforgiving.