All steel, no welding, 2000x1300x250mm

[eurikain]

Wal according to his first post he intends to weld them to the supports so not using conventional rails. ..Clive

That's right :) They will be supported at intervals. That's because they are integrated in the design. There is no efficient way to plasma cut full support profiles. Or you would need to cut the profile from lets say 20mm steel and stack all the supports next to each other, but that's just too much of a pain and would lead to alignment inaccuracy.

Supporting them at intervals won't cause binding of the 20mm plain stainless steel shaft, considering that the interval length stays reasonable. Current interval is 220mm on Y axis and 240mm on Z axis.