I dunno about the measurments and such, but I know that it is incredibly comfortable. I have very long fingers and hands, and you would think that the neck is too small. I play an Ibanez with the Wizard 2 neck wich is wider and a little flatter, but I am MUCH more comfortable playing with the Silo neck. Sorry if this doesnt help. Just wanted to let you know about how perfect it was even though it would SEEM to be too small for me hands.
The F$nders I've played that have the "classic" Vintage C neck feel much bigger to me than any EBMM neck I've had my hands on. It could just be a perception thing, but the EBMM necks always feel smaller.