I use GatorBoard to rough in the buildings. It's basically foamcore with a thin wood veneer instead of the paper used on Foamcore. Fantastic stuff. A little pricey, but great to work with. Here's a link the to construction album. Some of the pics show the GatorBoard.
Thanks Ken , Have asked around a few building shops and alike here in New Zealand ...They all look at me a bit funny when I say I`m looking for Gator board .... The only board I can get that`s close is the core board which I can get from the stationery shop ..which I brought a couple of sheets to try .
thanks again for your help ,
Huge K Hamilton Fan