He is not the only one who has been thinking about concrete, Mine is reinforced with 12mm rebars every 50mm, with 10mm steelplates inserted for rails.
Then levled the plates with epoxy before installing the rails.
Attachment 433962
Machine IS under build, wating for some parts on my X and Z axis.
Also changed from 2.2kw to 3kw ATC spindle, running DMM servo's, 2010 ballscrews and 20mm linear guideway rails.