Heard the call, ventured out to the shed in the dark of night... got you some figures Dave that hopefully set you in an appropriate direction...

Have both a Tele 12 and a 35yo acoustic 12 so will pass on both sets of figures... Mostly so you have something (another 12 string) to compare it to. My Tele build is a Maple fretboard and there is a build diary which I think shows a few photos.The acoustic is a bound Rosewood.

PBG TLA-12
Nut 47.53mm x 22mm
12th 54.91mm x 23.42mm
heel 56.52mm x 27.31mm
Strings at nut 41.17mm
Strings a 12th 48.2mm

35yo Eston acoustic 12
nut 48.85mm x 24mm
12th 59.7mm x 25mm
heel 60.5mm
Strings at nut 41.43mm
Strings at 12th 47.8mm.

Hope it all helps...