Yes, they've had to do a bit of work on getting the spacing right for the frame, but looks like that will all be set. And you're correct, the new wheels have a cassette of cogs, etc. so it sounds like it was a bit of a challenge getting it all together.

The bike is in quite pristine condition, with very very minimal wear, barely any scuffs on the paint at all, although one of the decals has worn a bit with age, so I'm trying to be very very careful to not damage anything.

For a bike of this age, would you know what the options would be for adding mudguards or a rear rack? It sounds like some of the clip-on options might scratch the paint, and I'd like to avoid that if possible. But I'd like to do some light touring with it, so having a rack and mudguards would be so useful.