Had a drizzly afternoon to finally get this thing out of the barn.
Apparently lifting the head onto the tracks is the critical part of the installation (and the manual insists on "at least two people"), but with the help of my rear forks and some careful manoeuvering it got shifted on fairly easily, on my own.
It rolls smoothly, which means the track may still be aligned.
Bunch of adjustments and tightening left to do.