It's taken me a while to post because it took so long to get around to reading it all !
Nice build and great write up. Will be very useful for someone starting out to get up to speed with it all.

Epoxy levelling comments made me think a bit and yes levelling without the bridge is possible if there is adjustment on the gantry to ensure the x bearings run smooth and the y axis is epoxy levelled afterward. Got me thinking which to choose for my mk4 machine. Still like the bridge but agree it can work without

Nice control box also and full of nice kit