Seems a decent write-up. ~~It is 3 nodes, and appears to use only two USB cables, which is not a mesh network but a very small fat tree.~~
Edit: parts list is a bit down the page and they do have 3 cables. Mesh achieved!
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Seems a decent write-up. ~~It is 3 nodes, and appears to use only two USB cables, which is not a mesh network but a very small fat tree.~~
Edit: parts list is a bit down the page and they do have 3 cables. Mesh achieved!