The rails arrived today. 1500mm SBR20 supported rails. I know I don't need such big rails but they may make there way onto a faster CNC later in their life and I got them for a very nice price on sale. Hopefully I'll make up a torsion box for the bed this weekend and get the brackets made up. Then I have to find screws - I'll be going dual screw as I have two NEMA17 motors spare from a 3D printer. I'll just be using standard metric thread rather than ACME or anything fancy as I need to keep it cheap.
Pictures will come in a couple of weeks when there is something to see (I hope)