Midistomp Six is now completely free and all the PCB, diagrams, code, and manuals are available publicly.
To download the PCB files, diagram files, and enclosure drilling files, go to this link:
https://easyeda.com/simonaglover95/midistomp
All the files necessary are now available on the “File Downloads” Page
Emails to midistomp@gmail.com will still be answered – so ask any questions you need to!