Ormerod 1 - Revised X-Carriage with belt clamp

Reviving my old Ormerod 1, a bit long in the tooth, I've incorporated parts of DC42s and JSTCKs OpenSCAD scripts (from 2014) into my own. The X_Carriage now has the original sensor mount re-instated (DC42 removed it) and has replaced the one-piece construction which has a very fiddly belt retention slot, with a two-piece design that forms a belt clamp. Most of the design details are in the script. The clamp is retained by two 3mm x 12mm cap-head screws that are retained by 2 3mm nuts pulled into their nut traps from below and hidden in the linear bearing tunnel. All other fitting are as per the original ReprapPro component.
The STLs only represent two appearances but in three rotations. The parts should be printed from one of the dissembled options. Any STL generated from OpenSCAD should have its integrity checked and fixed before slicing.
I have included the erct.scad library module that permits the rounding of cube edges. For details see my things.