Can easily be slid over the aluminum profile the horizontal frame is made of just by temporarily removing one of the four feet of the K8200. Fixed by an M5 screw it should remain in place and the z-axis stop switch should be fixed once and for all... ;-)
Many z-switch holder are mounted to the z-axis motor holder which in my book is nonsense. With a z-switch holder mounted to the frame of the printer you can disassemble the z-axis and won't have to recalibrate the z-position afterwards everytime.
Made it by using a caliper, Solidworks 2013 and just a little bit of savvy...
It's work in progress. I haven't had the time yet to actually test it on my real printer. It fits over the profile. That's all I can say so far. But I hope that I'll be able to see if the switch itself is positioned correctly (along the x-axis, kind of). It looks good but I won't say it fits before I've actually tried it by myself.
//edit 01:02am: Alright, it's fine. Fits like a glove. Might be that you'll have to rotate it to print it like I'd recommend: with the profile contour along the z-axis and the stop-switch mount upwards (like hopefully in the newly uploaded STL).