if a 2:1 ratio why not a 1620 or 1610 if you wants better precision...
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Design of the x axis, I prefer to build it tapered and to use bolts ,with minimum welding, since it is one man job and better to handle, plus I want to avoid metal stress.
Please feel to coment the design.X axis is made from 900x90x90x4mm steel structural sections.
Attachment 22238
Attachment 22239
At front and back of the steel tubes I will place two steel plates 5mm to stiffness the structure ,also the two plates ,left and right, are going to be 5 -7 mom.