If anybody cares... I asked Max Bat about the Wil Myers model WM1 and what publicly available model it is most similar to and the differences to said bat. The reply is the WM1 is a "Model R10 with a beefed up barrel."

Makes sense, I am fairly sure Wil started out using R10 in the minors and thought the WM1 looked similar.

http://www.maxbats.com/bat/r10/11

Made from extremely dense wood, the R10 packs a huge punch in a small package. The barrel is long and lean and has an appetite for cowhide.
Handle: 15/16" Dia. | Barrel: 2 7/16" | Knob: 1 7/8" | Weights: +2 to -3