Simple single column theme

I'm trying to determine the best way to give my users a secondary blog to display an iframe of 600x2400px property-search page.

My first thought was to just use a simple one-page, one-column html template with links back to their blog and charge them a setup fee, but I wonder if using a very plain them in wpmu (such as that is only used for "blogs" of this type might have more flexibility and some SEO advantages or something.

Anyone have any advice?