Thanks for your comments guys! Much appreciated!!
Today I had time to sit down to start working on some of the stuff from Gateshead. I picked up some of the last casts of his first batch and some of the buildings are a bit crocked and have air bubbles and such. I got a reasonable price and can gs mend it easily so no biggie.
I decided that the modular "Inquisition Chamber" wasn't big enough in its own rigt, so I added some of the panels from the GW city set:


BUT I'm sort of stuck at the roof. Either I put the two small towers on top of the roof or find a dome of some sort (we have a Hirst Art plaster dome somewhere), but I would also like to elevate the roof somehow, as it is too flat as it is.
I put together some bases for the towers to give them more height. The plan is to stick some plastic card cut outs onto the sides of the foam base with gothic window reliefs, but I think perhaps I should make them even higher? They are 10mm now.
I've also toyed with the idea of a shingled roof, but the guys at the gaming club thought it wouldn't look good.
Gaming-wise I'd like to keep some of the roof flat, so you can place your units on top, but I would have to add railings of some sort.
Anyway, it's too flat now, and I need some ideas on how to go from here, so all suggestion are welcome!!!
Cheers,
Thomas