I've run into a problem with my drive design after considering building an equatorial mount.  It sent me down a rabbit hole trying to design.  I was a little over zealous in thinking I could devote that much time to it.  So I am back to a simple Alt-Az mount and my pulley based "gearbox".

I do think it would be awesome if we could design up an open source printable / cnc'able equatorial mounting system.  This is a little bit of a grad undertaking, so I think I'll take this on AFTER I have a totally working telescope.