The drawings are my own yes, I took the time to measure each part and draw them out (almost anyway, the C5 isn’t finished yet). It will help me in designing attachments / accessories.
I found Graham Meek’s thread on his modifications, which are inspiring. One of my goals is to reverse engineer and understand (and hopefully one day, make) his screw cutting clutch.
Will subscribe to the magazine as well, and maybe try to find some older issues. Thanks for the info!