basically i make the initial masters from card and foamboard, i make them in there basic sections, so fronts sides columns floors etc so that i can make whatever layouts that take my fancy.
from these i produce a silicone mold, i use the best silicone so that literally it lasts forever and i can make as many casts as my heart desires. I cast using a very hard plaster called modell, this gives me a realistic look even when in its pre painted white, after painting the buildings look like real, i aim for something that takes my mind to where i imagine things to be like back in the world wars.