Neat!, A PI super cluster was one of the idea I'd had rolling around in my head as I've always wanted to build a multi node super computer for fun.
My lab not nearly as interesting though, I got a chunky server but other than that it's bog standard router, ips router/modem and a UPS.
Space, heat and noise are the major factors preventing my from doing what I'd like to do. haha. oh and money of course. Stuff soon adds up in cost.
Yup, space and power draw was a big reason I chose pis over a regular server(I still will probably get one when I move to my own place). I really dislike using the ISP stuff but its the only way I can get the upload speeds I need so I'm stuck with it. For now, I'll still be trying to court ATT Fiber to come to me. They just need to come 1 more block east.