hand of blues is right, the house looks nice.
you used the GW terrain book, right ?
got the same book and always wanted to build something, but my first house and my first hill i build as a test looked so crappy that i threw everything away and concentrated in painting
By the way i just remembered another article from the german confrontation forum (can´t find it anymore ) . the buildings where just as impressive, but that guy had a different approach for the round parts. he made bricks from thick plasticcard ( i guess Styrodul would work too) and build the tower by using the bricks like legobricks, gluing them together to walls, again with toothpicks as a help to make it more solid. In this way he didn´t have to bend stuff.
maybe thats help you just in case you can find exactly the same stuff that guy used.
Personally i guess the stuff is always the same. maybe different names, colours and patents, but since all this stuff has the same purpose and the same characteristics they can´t be so different.