Good call on the other bits. That door strap mounting must be really annoying. Is it the little bracket on the A pillar or the door side? It'd make me scream. But I am just a tad fastidious.
I'd be very interested to see what you think of that manual. I've never found (a good) one for the Lupo.
Also, don't forget brake fluid, gearbox oil and power steering fluid (only you are really pedantic!).
What condition is the subframe, rear beam, front sills, rear arches, roof channels, power steering pipe joins, brake pipes and springs? They can rust. Time for some waxoyl?