Possible to connect multiple Macs via Thunderbolt Networking (IP over Thunderbolt)?
Theoretically, yes you can do this. You would need a Mac with multiple Thunderbolt ports like a 2013 MacPro with its 6 Thunderbolt ports. Not sure if daisy chaining multiple Macs together will give you the desired effect.

This link seems to think that it will work but says nothing about daisy chaining only plugging a bunch of Macs into one Mac with a lot of ports.

So it seems that it is safe to plug a bunch of Macs together VIA thunderbolt which opens the door to you experimenting with various topologies to find one that does what you want.