Thank you. It worked. I had to build me a stand about half way up. then place one wrong and then it would place corretly on top of the wrong one LOL... but it worked :)

I have to line myself up at the corner, the right height you need to be at is around the middle of the middle of those 3 windows you can see at the side there. You can just about see it snap in above you.

is there a trick with placing the corner battlement pieces? i cant get mine to place corretly