CMS Made Simple Forums

Yes I think it would work just fine...

I've been using CMS Made Simple for almost 8 years now and this is a perfect match for it. Matter of fact, here is Auction company that uses the Gallery module to show the items being liquidated,
http://www.dafolsomauction.com/calendar ... -Equipment

CMSMS will easily be able to provide the functionality for you website. I would strongly advise though that you get a professional to design and code it looking at your current site as if done correctly then in the long term it would make good business sense.