time to gather parts for new machine

[JAZZCNC]

Hi Dean, What your asking is very hard to answer accurately without knowing the design and will change with different design.!
That said I'm soon going to be building for someone a steel framed machine with very nearly the same dimensions.! . . . .So to give you an idea i've just quickly changed the Cad model to give the length you want, width was the same or slightly more anyway.

With a design like the one in the pics below the X axis screw would be Approx 1400mm and the Y axis 825mm. The rail lengths would be approx 1475 and 850mm.
The model is just at a very rough concept stage so nothing is aligned or setup and things like gantry sides will change shape, position etc with more work on the frame and more trimmings will be added like covers for screws and igus chain etc but it should give you an idea of how it would look.

Every thing is 1/1 scale so motors, spindle etc are all correct and all materials can be got or cut from products that are available of the shelf, IE gantry sides (as can most of the gantry and Z axis) be got out of 200x20mm plate from Aluminium warehouse, 80x40x3mm Box section from local steel merchant etc. The adjustable bed is steel frame with KJN's 90x45 profile but could easily be replaced with MDF to save money.

Hope this helps and just ask if you want to know anything.