No need for sorry Wal.
I've actually made a laser CNC with printer stepper motors, she didn't last long.
did however enable me to cut some pieces for an upgrade that i'm almost happy with.

As to the WHY!
Well I'm my own biggest pain in the arse, often aking things far more complicated than it has to be due to using junk laying about.
With a healthy splatter of cheapness sprinkled lovingly over the top.

I find a healthy amount of abuse for being sooo stupid does one of two things.
Correcting my thought patterns (temporarily) or pushing me to prove someone wrong (50/50 success rate).


So to summarize your appreciated post reply,
don't be a nob, just buy extrusion. (OK I can get behind that).

Shall I get SGR rather than SBR then mounting should be pie as a single line of centralised screw holes (me starting to think so).