Makerspaces Mackay Token/Coin

I created a coin/token for use as a demo piece, it is a little work in progress.
In time I will release the OpenSCAD source for this design.
Printable with a 0.4 mm nozzle and 0.2 mm layer height.
The STL is messy, and OpenSCAD is currently very slow to render it.
If you clean the script up, share it back please. I won't have time to do so for 6 months.