Ideas for old MK3 mods?

Hey everyone, pretty much the title. I have an old MK3 (not S or +) laying around that needs some electrical work to get printing again. At this point it would just be a bonus to get it back up and running so I was thinking of experimenting with it.

Anyone know of any crazy mods out there for it? Something like adding a tool changer system, or converting the hotend/steppers for crazy speeds?

I have 10 years of printing experience so I'm no novice and I'm happy to experiment!