Advice for rigidity upgrade. To profile or not?

[routercnc]

Thanks Jazz. What about doubling or even tripling the 2mm plates? Bolting them all together?
Would the 40x40 profile frame be better than the single 10mm aluminium base?

Cheers

I would use a single piece of 5 or 6mm but if you already have the 2 mm plate then triple it up.

I would do both - the 10mm plate to act as the sub base to be tapped into for fixtures etc. then add the 40mm sections underneath ensuring they are joined to each other.. Adding another skin under the 40mm sections (even 2mm steel would be good) to make a sandwich.
But it won’t count for much unless you can tie the base to the sides. Do you need open access both ends ? Can one end be full height shear panel joining both sides and the base ? Or can the corners be triangulated at least rather than squared off as drawn.