Committing a very ugly and dirty v1 of the Kossel effector platform for a Steve's Extruder.

V1.  Dirty.  Needs a lot of love, and I've got to verify measurements
against a physical part instead of from the CAD designs that may or
may not reflect reality.

I think the sizes are probably more uniform than they at first appear.
Also, I can unify anything that uses the same size twice to reduce
variable count; for our intents and purposes, a constructed Steve's
Extruder is a single assembly, not a collection of parts.
Updates based on measurements.

Re-measure off of an instance of the hotend, rather than off of the
CAD.  There's a whole lot of mismatch between what is and what the
drawign says.