Yes, I'm gonna build a Raspberry Pi 3 Cluster to bring my overlay and P2P research to the next level.
I'll probably start with a 15-16 node Cluster, to make a few tests.
And then move to much higher numbers (64, then 100?).

It would be fantastic if I'm not the only one building and running such a cluster,
so I will keep you updated with any cluster-software I create so you can test it yourself.
Especially if you are a patron.
I keep toying with the idea of building a (10) RPi 3 Cluster but don't know what the hell I will do with it when it is done! LOL - I am not a programmer. I see all of the tutorials online about building them and honestly the only thing I can think of is if there was a way to mine with it. Other than that I don't know. I just think to build it would be really cool! I am a geek for hardware!
Well, one of the things you could always do with your RPi 3 Cluster is use it with the spreadwallet, and manage your 10 favorite coins with it. (1 full node per RPi 3).

BTW, using RPi 3s for full nodes is just one of the tasks they could fullfill, but there are other ideas I have of how to put those "tiny 24/7 workers" to good use:
1) Exchange-Tick-Data Aggregator, so that you recreate a coinmarketcap-style site within the spreadwallet (and better yet: have access to historical tick-data if you let your worker run long enough)
2) Trading-Bot so you can be alerted or trade directly within the spreadwallet
3) Address-Observer, get alerted when there is movement in a coin address...
etc
Maybe you could explore a few ideas of your own? What jobs would you give your oompa loompas?
I'm currently not spending any time on this apect, but I'm just saying I design the spreadwallet's architecture as an open system, where other devs can add functionality in the form of plug-ins/dlls (each representing a worker-functionality and its overview screen)