Hi Greg,
Well, as insane as your request is, only because we are the design team for this site, I think we can do it!
We follow the postings here and every once in awhile someone comes along who wants something exactly like, or similar to another site we have created.
If you like the Sotheby's site, then let us talk further. Prices will variate if you truly want an identicle site. Naturally, due to copyright infridgements, there would have to be some alterations, but this can be done for you quite quickly. That site in particular has a lot of backend management as well, which you may or may not wish to have as well. That can all be determined once you have decided to use the same company that built it.
We will watch for your response.
With regards,
JM