Hey Sherm,
I was reading an older issue of Tamiya Model Magazine (issue 92) where they converted the Tamiya shermans into 4 different models. They mentioned this website for a reference, and I thought you may want to check it out.
http://web.inter.nl.net/users/spoelstra/g104/index.htm
I wasn’t sure if you had seen this one, and it does not look like it has been updated in a while, but thought I would throw it our for you to see anyway.