Hi, pezzy!
Like Bouzy210, I like the design also, but there are a few things that I would like to ask and/or suggest.
The menu links I'd suggest you change the colour to something a bit more lighter. The orange text on a white background doesn't sit well with me. The blue that's used when you hover over is a nice colour, but I think the text should be either that colour or black. The orange link text up the top on the black background is fine, because the contrast of colours keep it from straining the eyes, at least for me this rings true.
How are you planning to display the preview images in the space you've reserved for them? I think this element will be one of the cruical pieces, especially if you plan to use the site the way you have suggested in your original post, because that will be what people use to reflect on whether they wish to use your services or not. Perhaps it wouldn't be such a silly idea to make the preview pane area bigger and more pronounced so that people understand this. Possibly even having a "Preview" heading for that section would help drive the point home.
Apart from those things, it looks quite good. Keep it up!