It looks sweet! But you know what, you should have a look at some of the pre-fab houses for larp-purposes made by the Danish group "Einherjerne". If you get in touch with the guys behind them, I'm sure they wouldn't mind giving you a few pointers on how to do these yourself, and it really helps create a city-environment. Here's a couple of pictures with them in use, and one being assembled.
Speaking from personal experience, it doesn't take long to set up or pull down one of these bubbah's - they're made for quick assembly/disassembly - and they add tons to the setting. I was part of a city watch in a game a couple of years back, and there's a huge difference between patrolling a tent-camp, and actually walking down streets and alleys lined with houses.
If its something you want to look into, I can try to hook you up with a contact on my side o' the pond. They're based in the city I live in, so it should be doable.
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