Thanks

The strength? The whole castle weighs a few grams, so even if it´s dropped there will be no damage..or very little..and a lot less than say a plastic castle. I construct my buildings like this;(not brilliant as it´s for a medieval hut, not a house, but the main idea is there)/
http://paulsbods.blogspot.com/2011/06/medieval-hut-how-to.htmlThe trick is to use the lines in the back of the foam as "structural supports". For wall etc I make sure that the lines run from bottom to top..it gives strength. If the are built with the line horizontal then the walls bend / sag.
The walls of the castle are made up like a sandwhich, two sheets of the blue foam to form the outer wall, one sheet of 20mm white foam and a sheet of blue foam inside. it had to be made like this so I could inscribe the brick pattern.
The chimeny and the "abbort" are made from thick blue insulation slabs.
The brick pattern? Yep...just by using a ball point pen, Dr Willets knows this trick as well (Hi

) and has a couple of good detail shots on his blog.
The foam has to be this type, It´s used on Pakett flooring as an insulation/sound barrier. There´s some that comes in rolls or has no lines on it...it´s cheaper but don´t try it...it doesn´t cut or mark very well...when you try to write on it ..it "rips".