Hi cncgreg,

Welcome to the forum! Interesting post, need a bit of time to visualise all the aspects of this design. Do you have any isometric dwgs (i.e. from an angle).

Couple of comments:
The y axis looks like it has an unsupported overhang, is this part of the requirements?
The cutting table also has an overhang, with a bracing piece. Can this support be improved?
Can the supports basically all be moved out to support at the ends?
Are those bracing wire cables or solid thin bars?
The gantry looks a bit small in section compared to the large offset down to the cutting area. You might want to upgrade this part. In fact the more I look at that aspect, the more I think it might be the limiting factor in this machine.

Looks a bit like Florin's design (search for his recent build posts), although compacted down in one axis. Maybe have a look at his design before cutting any bits out?

Good stuff anyway and wish you well with it . . .