Hi Clive
I have the base made which i welded for a friend but then he moved house and didnt have room for it so got it back but thats about it.I think i understand what you are saying something like this
Click image for larger version.  Name: cnc base and gantry to scalefront lines2.jpg  Views: 192  Size: 112.1 KB  ID: 20295
Click image for larger version.  Name: cnc base and gantry to scaleinside1.jpg  Views: 177  Size: 223.0 KB  ID: 20296
Click image for larger version.  Name: cnc base and gantry to scaleinsidemotor.jpg  Views: 198  Size: 120.4 KB  ID: 20297
Cheers