that sounds very interesting Guy..............
one of these days I'm going to be getting fed up of building model boats and ships (as I'm running out of prorotypes that I wish to build), and settle down to something I have always wanted to do, and that is an "N" guage railway layout in my workshop........I had never thought of moulding such things until you just told me what you do.............I suppose the options are endless reallu, with wall sections as you say, being moulded and used for scale buildings and such.
I'd very much like to see some of your work, and wouldn't mind at all if you posted some pics of your work on my thread, if you wished to do so.
cheers, neil.