Thanks guys

@ Nick: As of last year, I've become a student of the school of Proxxon. [GONG]Clang![/GONG]
Meaning I am now doing most of my building out of styrodur, using a foamcutter. It allows for much more intricate shapes, a lot of which I still have to try out. Coincidentally, I received my copy of Gé Boom's seminal work 'Buildings - Tabletop terrain from XPS foam', just after I finished my last building. I'll be sure to use loads of the techniques in that book in the next build though.
Also; foamcore is not as prevalent here in the Netherlands as it is elsewhere, and I've had abysmal luck trying to remove one or both sides of the sheets we can buy over here (which are rather expensive to boot)...