We’ve uploaded the full details of how the Mk3. staging mechanism works to here:
And a full tutorial on how to build it is here:
The tutorial has step-by-step instructions with photos as well as a 2 part video that shows the procedure.
We’ve also uploaded a launch report of all the test flights we have had with the stager over the last 2.5 months. The launch report contains a highlights video from these launches: