Robin do appreciate your comments, so far I managed to skim 10mm by putting spindle closer to the plate.
Problem is that I should ask first and fabricate later. I am seating on it now - previous correction was easier to do.
I will put X axis bearing on top and bottom of the gantry - saving a lot of distance but sacrifice stiffens (extra 50mm taller legs)
Regard the bed bearings as you see from current design they are in between spindle center point - so perfect position (this will moved towards gantry later).