not that unheard of though back in the days when cars were still allowed to limp around the track for just one lap at the end of 24h after hours upon hours of repairs just to show up in the results
But they're not actually building it, but merely assembling it... Not that it isn't a feat in itself, but I rather thought that someone was really building such a vehicle from scratch, so I was actually somewhat disappointed by the still awesome video.
Depends. A prefab house is certainly assembled, as the whole thing already is done and just has to be put together.
Using traditional methods, the final product isn't set and prone to chnage during bulding, thuis you build it.
I'd imagine the part count isn't too different between the two; but in eithe rcase, an F1 team has a lot more people working within it to re-build the car, anyways.