Another end-of-building-day update.
The pre-production prototype Y axis carraige and the Z axis are almost done. Close enough to look like the CAD design after another busy stint in the shop. It needs some tweaking and finshing and then it's reay to mount to the Y axis gantry. Should then be about ready to fire it up at that stage.
Safety tip: don't pop out to the shop in your socks to check on something quickly until after you've cleaned up all those metal shards from earlier drilling and cutting. If you really must, at least make sure there's a good tweezers near to hand.