I have been thinking about having the bed raised above the rails to make it easier to get materials on and off the machine as suggested by another person.

If I was to leave the design as it is, is it acceptable to have a lighter steel (say 25x25x3mm) frame inside the outer rails to raise the bed above the rails?

Obviously I would have to increase the height of the gantry to allow this and I would also lower the rails from the 80mm height they are at now to more like 20mm.

Thoughts?