One of my hobbies is instrument building. The results are purely for my own amusement and use, so the quality is somewhat short of any definition of "professional". Some of my attempts are recorded in these pages.
Sometimes I remembered to take step-by-step pictures, and sometimes I didn't, so the usefulness of the links vary.
Click on the pages below, have a look around, and email me comments. (I have made a handful of instruments, but I only have documented one here so far. As I get the time, I'll try to upload more photos and descriptions...)