I've sailed on 2 hull
Number 1's and both boats were difficult to put it mildly! One was a Swan, the other a Warquiz (1997).
Both boats suffered from taking from the plans to the actual boat. So wiring
, for example, that didn't fit would be stuffed, streached, cramped or rammed into any space and you could hear the bosses say: "Just do what you can and we'll fix it on the next boat".
So your Grandpa was prolly right!
Work out the speed of throughput and given 3 months for the first boats' problems to filter up to engineering and back down again. So for a mass production boat be wary of buying
the first 10 hulls, perhpas.