Bostick-Sullivan;
http://www.bostick-sullivan.com/cart/home.php?cat=323

I've been wanting to try this for a looooong time but will probably never

I've also found that google books has many digitized books from the wet plate era that describe the process in detail. You may have to convert some old measurement standards or naming standards but i've found it to be very good reading.
http://books.google.com