if someone is interested, I did a FreeCAD Model, there is a table with parameters so you will be able to modify the height easily:

https://www.kardeh.net/wendeltech/m5stack/M5Stack_Proto_FreeCAD_Draft_29April2018.FCStd

I also published the measurements and the stl,... :

https://www.kardeh.net/wendeltech/m5stack/m5stack.html

Have fun, I hope we can get some awesome modules available on ebay,.. .

Seppel