Steel frame cnc router design/build

[JAZZCNC]

Bumpety bump for my gantry design above...any thoughts?

Erm.!! . . . It's ok but there's not much holding or supporting that top rail piece. 5mm Ali has no strength in it so your gaining nothing from that really and the Steel plate doesn't add any strength.
The triangle piece on the X axis is about the only thing supporting it and that's not enough it will flex under cutting and transfer to finish quality.
At the very minimum I'd have 2 triangle pieces at each side, really i'd make the gantry sides wider and tie the end of both rails into sides has well as double triangles on each side.

On a plus note you could drop those pieces between the rails and steel has you can drill & tap the steel directly. You only really need those when using Alu profile.

Beef the holding of the cross rails and it will be ok.