An article about it can be found in Panzer Graph! Issue 3 Winter 2006.
Along with more great photos!
The two Shermans are only one part of the diorama. There is a M10 at the other end and a wreaked Schwmmwagen. The article has lots of tips on making some of the details and how to adjust the suspension. The M10 is featured with a nose down atitude as puts on the breaks after cashing through a wire fence.