Just about all of the above...these should have been check boxes instead of radio buttons. The only one I've not done is to grind my own ground glass...I find the stuff from Dave (SatinSnow) to be wonderful and inexpensive, and the thought of making my own as boring, so I don't bother.
But I build and/or modify my own cameras because I want things that aren't available...I fix my own equipment because it's easy and cheap...I do all of my own work with my film and a lot of my own chemicals because it's a blast to do it. Actually...I do everything I do because I find it fulfilling. Forget the other reasons...I do these things for the simple pleasure of doing them.
All but ground glass. I've only mounted my own slides a couple times, I've built a bunch of pinhole cameras, and I've done small repairs to my cheaper cameras. Everything else is pretty regular.