Albeit only momentarily, I made a new spindle mount to set my machine up for 5-axis:

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But I cant think of anything to make with it :lol:

Clearly I need to drop the bed down (which is fine, it's adjustible) to get enough clearance.
I can also mount both rotary tables and the spindle on the Z-axis to get the spindle rotating in XYZBC configuration. May need some reinforcement. The reason I made my Z-axis have 400mm of travel is to allow sufficient clearance for future 5-axis machining with that set-up.

Unfortunately there's quite a lot of backlash in the rotary tables, which is difficult to eliminate, so it's probably only going to be useful for woods and plastics. Ideally I should make a BC mount for the spindle using harmonic drives (too expensive), or double worm wheels preloaded (generally annoying), or timing belts (struggling to find info on how much they will stretch). But is it really worth it?