It's only a rake of nine coaches you say, shouldn't take too long. That's only 18 sprung bogies with 36 axles, 72 wheels, 72 pairs of brake hangers and 144 brake shoes to assemble. Don't forget the 36 cosmetic sides. Then there are 18 Kadees to assemble and fit (after modifying the coach ends to take them), 18 corridor connections to assemble and fit, 9 sets of underframe detailing to cobble up, 9 roofs that need all those strips removing. Numbers to be changed, bogies and roofs to be painted, sides and to be weathered and I guess we ought to have a few people. Well, actually, rather a lot of people to be painted and placed on their seats.
BUT at the end of a day spent assembling just one pair of bogies (if there aren't too many interruptions), you can slip them onto the coach and send it gliding at speed through a double slip and a couple of turnouts without a care in the world. Ah, what joy!
Ah well, with five coaches down and four more bogies built we are well on the way. If you forget about the other 12 coaches still in their boxes, that is!