I bought the MiniTown Loft Kit from Hobby Builders Supply.
I've uploaded the stock picture instead of an image of my own because I've put the thing together and yes, it does look exactly like this.
I'm envisioning this as a 2-person office space, maybe for a start-up web publisher or something, and I want an urban/industrial vibe to it. The floor on the main level will be concrete, the floor of the loft will be wooden. The back wall will be brick; I will paint the other walls but I haven't decided on a color yet. There will be a small powder room in the rear right corner of the main level, and a kitchenette in the loft. The rest will be office space.
I also bought the component kit because I don't feel like cutting plexiglass and trim for all the windows and skylights. I think the staircase (which also came with the component kit) will take up too much space, so I will bash it into some kind of switchback arrangement.