An update, although bereft of pictures because I forgot to take any, and it's dark now. Trying to get this up together for OWMTBC this weekend, so time is short
Stripped it all down, gave the bits a decent (but not obsessive - like I say, time is short) clean. Stripped and regreased the front hub, which turned out to be perfectly OK inside, just badly adjusted. Didn't take the rear apart, just nipped the cones up a bit. Ditched the pie plate
Took the forks out to touch the paint up (just a quick sand of the bare bits and a dab of Plastikote for now - not great but beats bare metal) and the bottom race came out in bits. Happened to have a new 1in Ritchey headset doing nothing, so wanged that in. DX STI units need attention, bike now wearing XT thumbies and SS-7s (a tad early, but I'm not going to sweat it) with some chunky Grab-Ons to finish off. Took off awful tyres, have nothing of appropriate vintage so it'll be on modern Contis for now.
The Aerator post will be a project all of its own, I suspect - at the moment the guts are on a shelf. Need to rummage out some sort of saddle to replace the rather forlorn Vetta. May have to raid a San Marco Bontrager off another bike...
Will try and grab a couple of snaps tomorrow