Here you go, Goos80 (with a name like that arn't you feeling nervous at this time of year ) dxf of the Y axis, only uses 25 x 25 x 1.5mm tube and is really solid with minimal weight, though with that servo... and the spindle weight 15kg I think... It's still a heavy lump though I can still move it easily enough.
Usual discalimer with the drawings - if you break you leg don't come running to me
At this point I'm not sure about the uprights, I think they might sway so there could be come external bracing to do