I think there's something to be said for sizing a raspberry pi or a clone to fit into a hard drive slot.
I also think the TuringPi people screwed up with the model 2. Model 2 of a product should not have fewer slots than the predecessor, and in the case of the Turing Pi, orchestrating 4 devices is not particularly compelling. It's not that difficult to wire 4 Pi's together by hand. I had 6 clones wired together using risers and powered by my old Anker charging station and an 8 port switch, with a few magnets to hold the whole thing together.
I also think the TuringPi people screwed up with the model 2. Model 2 of a product should not have fewer slots than the predecessor, and in the case of the Turing Pi, orchestrating 4 devices is not particularly compelling. It's not that difficult to wire 4 Pi's together by hand. I had 6 clones wired together using risers and powered by my old Anker charging station and an 8 port switch, with a few magnets to hold the whole thing together.