Thank you! I did indeed run into the mapsize issue with strfry. The PI in this instance is just for internal use so no issue with load.
I'm definitely down to try a haven relay at some point, it looks really cool!
https://github.com/bitvora/haven and https://github.com/bitvora/wot-relay are both special purpose relays that run on raspberry pi.
I also ran https://github.com/hoytech/strfry on a rpi a while back. you might have to tweak with mapsize param so it matches your disk/memory card free space.
The one i'1m currently running is a "custom made" based on wot-relay (removing the web of trust part).
For personal use, i recommend haven (make sure to set "badger" as the DB in the configs). It's made exactly for that (has inbox, outbox, chat and "private" relays all in the same server).
if you plan to run a public relay, don't count on an rpi. The amount of data writes is huge, and will keep your machine always with a very high i/o wait time. I recently migrated my public relays from the rpi to an external VPS.
Discussion
unless you block external use some way (make it authenticated, or block in firewall), you'll run in load issues because people will start connecting to it when it starts announcing itself to the network. just wait for it...