Examples of small observatories that individual amateur astronomers have built for personal use. I started this list when doing research before building my own observatory. I got a lot of good ideas by looking at what others had done. Perhaps you will, too :-)
Building a small observatory is not all that hard. A simple roll-off roof design can be built in a few days with simple tools and materials easily available in your local building supply store. A dome is much more complicated but still can be done with more careful planning. Or you can buy a kit.
Note: New entries are marked with an asterisk