Just saw this on Solid Smack:
I have now. Interesting. Wonder if they have any thoughts on porting it to Android?
The main takeaway Siemens needs from this is that Catchbook deperately needs controllable dimensions and other tools to make sketchs more predictable just from a 2D aspect.
I attended the Catchbook class at SEU2016 and learned some tricks, but the main tripping point of Catchbook is that it is "non-scaled". The first dimension placed sets the "scale" of the drawing, but trying to place and edit subsequent dimensions leave you chasing your tail.