It happens in every shop - projects get started, and then pushed aside for other, presumably more pressing, projects. Last November, I started a project to upgrade my metalworking lathe, one that promised to make the lathe more accurate and cut with a better finish. The first detour in that project happened right away, when I managed to wear out a gear in my mill while making the lathe part! I documented that here.
The "fix" in November left me with a mill that works better than ever, but in the process of doing that, I just put the lathe back together so I wouldn't lose any parts, and somehow did four or five other projects without ever getting back to the lathe. Well, no more - I decided I wouldn't work on anything else until the lathe was done!