Thanks @iKNOWaFATman … real life kinda hit me hard the last months, I actually didn’t touched any e-skate stuff in the last 4 months as I got distracted the whole time 
I just cracked my Phub-141 open (gone the same way as Jopj by just hammer it. The Phub-141 looks as expected very similar, but mine is dirtier and slightly damaged (broken magnet, separated laminations, the stator also seamed to rub a bit on the magnets).
The dimentions of my Phub-141 (@Jopj please validate if the stator is the same on the 188)
My motor has 30 magnets (->15 poles) my calculated ERPM (from my last experiments) is 175 per volt, devided by the 15 poles that gives me a kV of 11.7
It has 2x 6202RS 35x15x11 bearings
The hallsensor board is just glued on top and not coated, there is no o-ring on this motor either but the lits where both also glued with some kind of silicone glue. So lets say somewhat water tight but not water proof, the sensor could die prematurely pretty fast.
My terminations, likely wye I didn’t looked to closely yet but changing the termination looks very doable 
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But as you said the stator/motor to hub size ratio is really low, there could at least fit a way longer stator in this thing.