It's a very rewarding hobby, from making the mirror (manual labor + measurements with interferometry), silvering it (a bit of chemistry), designing in CAD and building the actual usable telescope, there are a lot of moving parts to design, and steps that you can either do or delegate. I think anyone who likes manual work can find a piece of a telescope that's enjoyable to work on.
The feeling you get after a few nights of hardware debugging, when everything properly works and you get a sharp focus in a clear night, that's quite a step above any of my other hobby projects to this day (:
Plus, you can always improve it with ergonomic modifications or additions to make observing sessions smoother.
Edit : here's a pic at first light of my last one (8" f/3.52)
https://camo.githubusercontent.com/5939ba170acf1e9d6462d8268...
Now moving on to do twins 16.5" and 16" mirrors and scopes with a friend who is joining me into this adventure :-)