[Halbmond]

That's a pretty impressive-looking design. But if you're planning to cut stone with it, remember to save room in your budget for bellows all around, since the abrasive dust and slurry will get everywhere and destroy your moving parts.

Thanks pal, it is a good advice. At the begining I was going to use bellows only for ball screws but i will use wide "U" shape accordion type fabric bellows all over the screw and rails.
Telescopic metal bellows are too expensive and not vital for this design
Metal bellows are good choice for moving table type cnc or moving bridge with long foots.