A client library and UI for Lemmy, has most of the basics in working order now. interested to hear your feedback if you give it a go. other complex UI features like rich post composing and image handling will be ported from mastodon.el.
it is designed to have a clean API layer, so the functions in lem-api.el could be used to create other interfaces.
lem.el also implements a client, similar in design to mastodon.el. i did the api layer so that others could implement other kinds of interfaces such as a gnus backend if they desired.