Rebuilding terribly engineered laser cutter

[threedee]

Electronics are not the problem - Controller+front display panel (RDC6442S), 2x stepper drivers (0.09-1.13A M415DRV), 24V psu, laser tube HV psu (MYJG100W), 2x nema17 sized motors (cant identify by marks). Motors/drivers can be replaced if needed. For now it works.

The motion is another matter. If anyone is familliar with K40 laser construction, mine is that scaled way up past reasonable limits. K40 is 3020 bed, mine is 9060, runs on same XY essentially. Which is BS.

Problem is there is so little space and no continuous plane to put down reinforced rail on right side.
There are bed lift bearings located in the floor of 70mm wide space could have been used for rail. Same 70mm space houses drive belt, drag chain and said lift upper bearing blocks.

Any way to put down reindorced rails are to raise them off the deck somehow.