If you guys want to build Shermans, I'd be more than happy to join in, as well as offer help and advice.
I'm no expert, but I do have several books (including Hunnicutt's "SHERMAN: History of the American Medium Tank"). I have also built many variants of the beast over the years (I'd count 'em, but I always run out of fingers and toes), and I'm pretty familiar with all the kits that are available.
A great place to start (if you want to do a bit more than just build right out of the box) is Tim Streeter's U.S. Army Models website. Check his articles page:
http://www.usarmymodels.com/ARTICLES/articles.html Tim has a nice collection of articles about correcting and enhancing the most common Sherman kits.