Thanks for the heads up guys. All the material is 10 mm thick and 150mm wide. I had wondered about the the plate for the gantry but thought I could add box/angle to the back if required. the rails are 16mm

Unfortunately I have already ordered the lead screws and they are rm1605. I really should ask first DOH!. I am going to look into ordering the motors controllers this week sometime.

The angles on the rails were left hanging for, just as you say, the support for the nut on each side. I also thought that this allowed for the Y screw supports to be further apart and thus allowing me to use more of the bed width.

I really appreciate all your help guys
Bruce