OK, now you have a nice picture. We could all agree it's the coolest design we have seen for a while.

Arc welder? Yeah I arc welded half of the first machine I made. But from now I am telling you it would be a mess with this design. Read my build where I changed at the last moment my gantry design cause I couldn't weld it as I designed it first. Luckily for the better.
And I have arc, mig, tag.

You should listen to your heart but also to your brain and your pocket.

At the end it should be doable in real life. That's the important thing.