Well, after a bit of testing, everything seems to be working with Potatoe! There is an issue with sending emails though -- this is running on my home network, so my ISP blocks outgoing requests to port 25 (the port mail servers have for listening to incoming mail).
There's also an issue with federation -- you might not be able to see the same number of posts/comments/votes as you would on servers where those posts/comments/votes originated, but this should be fixed in a later update for Lemmy (which is the reason why I'm on the latest branch).
Things are still a little bit experimental, and this is running alongside a lot of other software on my 4 GB Pi, so I can only accept a few applications at the moment. If you're interested in anything Potatoe, please send me an email! I'm pondering getting better hardware, but I want to see how much it's needed first.
Thanks for checking out my server and enjoy your stay!