With original tabs mounted as close as possible, fit was pretty good...
but I wanted some slop to mount too tight.  I moved in inner arc a bit
so that plate could be hard-clamped if desired.
Move the mounting scres a little off radius if too tight, it should fit fine.
added tabs to carriage to help hold belt
moved switch mount out a bit on endstop
corrected tilt
beefed up frame a bit.
Still could make thicker around bolt holes
nice little wiring tab that fits into slots of 15mm extrusion
new mount, turns extruder sideways
thinned a little.  thickened tab into slot.  Made outside hole go all the way through
Merge branch 'master' of https://github.com/Mr-What/kossel

Conflicts:
	wheeledCarriage.scad