An update!
I've paid Nessy a visit today, and scoped out the potential.
Good news:
# Rear brakes (shoes and cylinders) are new, and very damn clean.
# Steering rack seems to be fine, as do a couple of other little things that had me worried.
# Prep work is done (removing old exhaust, etc).
# I've done a fair bit of cleaning and 'reassembly'.
Bad news:
# The interior is in a heck of a state. Working on that one with Hugh

# As yet undiagnosed slow cranking problem (probably related to the flat battery)
# Rust is a little worse than I remembered, but still nothing terminal.
# Front number plate is cracked...another tenner gone!
# Since the Summer vid was made, she now runs like poop. It was dark before I cranked her over (not a big priority right now), so I'm not too sure of the score there. Not a biggie anyway.
Verdict:
This is very much do-able. The bill for the garage element of this will be bigger than I anticipated, but hopefully the DIY bill will be smaller. It's down to Ruth to confirm she definitely wants the car, my garageman to confirm he's up for it, and Nessy to get me to a job in London on the 6th December. That means 'the working party' will probably have to do our thing next weekend (25-27th) sometime. All and any are welcome - I'd like to use this as a opportunity for people who wouldn't normally poke around their cars to get 'hands on' with a 'low risk' project.
Big thanks to Andy (pettaw) for his advice so far.
Two happy cars...
cheers
James