Yes,

I like overbuild, but isn't that a bit too much for 1000mm machine?

If you have experience with welding why don't you make the machine from 100x100x3 profile steel and use aluminum for the gantry and Z only?? And maybe for the YA if you prefer and all esle from steel


I don't like the type of connection you are showing. For me best is or plate or angle. And now angles are so cheap, i would use only angles and a couple of plates.