Thanks everyone. BUT all change!! (for the better I think, read cheaper and Easier!!) I have spent the day on the floor with paper templates that I will be using. I have discovered that I can fit the the templates onto 2 half sheets IE 1220 X 1220 with very little waste.
So Ball screws all round and Hiwin 20mm blocks and rails.
I have sketched a frame for your perusal and comments that I will post shortly (when the kids have finished homework). Is there a preferred format?