I wouldn't consider it to be super compact, almost two chunks and an estimated 15 block height.. But still possible to hide underground of course. I'll try to hook it up with a fully automated tree farm and some furnaces that keep making charcoal. The charcoal will be nice but I imagine it may be the perfect way to provide xp for repairing single tools. Maybe I'll come up with some logic that can charge a furnace with the exact right amount of xp to fully repair a netherite tool before switching to the next furnace.. I already figured out a compact way to fuel the furnace from underground. It'll make great repair stations spread throughout my base :3

I'm playing on a server so it could run 24/7 to charge xp, so even a slow rate will be fine.