The deficiencies were minor - chip guards to keep metal chips off of the ball screws and sliding surfaces. It came with one between the back of the cross slide and the Z-column, but somewhere along the line that has been damaged (obviously, I must have done it, but I don't remember when); on the other hand, it never had one in the front, between the cross slide and where the handwheel used to be. It never needed one, except for the fact that I cut away an inch or so of base on Hoss' recommendations (top picture here), and the ballscrew would get exposed when the slide was moving toward the Z-column.
I ordered a sheet of 1/16" neoprene from an eBay vendor, cut it to size and replaced the back piece. Then I cut a second and made a skirt for the front. This required cutting a little piece of 1/8" thick aluminum to clamp the rubber to the front of the slide, drilling a couple of holes and making a cutout around the oil fixture, but it was an easy job.
video here. Chips, dripping coolant, small families of illegal aliens; anything could get in there. In one of my GB-22 posts I showed a zip loc bag taped to the fixture so that it covered the opening when the table was forward.
This needs a little work because the sheet on the front pulls toward the column with no problems, but when the table pushes back, it doesn't get out of the way. I need to figure out something to do about that. Maybe it just needs to be a rigid piece of plastic and not a long floppy piece like that sheet rubber?