Okay, I'm calling it a day.
We now have a chain, a Cyo, computer and cadence sensor bracket (molished from a pound shop camping stool), Garmin mount, and a nice healthy bundle of Mr Schmidt's finest coaxial cable (some cable ties are slack in anticipation of having to replace the front gear cable with a slightly longer one pending ergo-tesitng):
Cockpit view:
All primary controls moved to the right hand, both front brakes on a single lever, bar-end shifter (I removed the spork for cable access) controls the front mech, grip shift the rear:
Bottle dynamo (I've forgotten which and I'm not going downstairs to check - whatever came up tops in my bottle dynamo research back in May), rear disc brake controlled by standard lever on the left hand (the front brake lever includes a parking lock). Smart bracket on luggage rack.
Almost finished: