Jackdaw,Tanq,
I admire your enthusiasm but I don't see the leap of logic you attempt here.
The underbuilt sump areas in some but not all of these boats would amount to a few bucks of resin, cloth, and time. Beyond the money guys, designers, managers, builders, and QA people would have to be complicit in weakening the single most important part of the entire hull of SOME of the boats. If someone would have died of a result it would be manslaughter. Is that really what you are saying?
I think Hanlon's razor fits better here.
I agree that Hanlon's Razor may be the answer especially if you had production staff changes.
Hanlon's Razor "Never attribute to malice that which is adequately explained by stupidity" or Occam's Razor "among competing hypotheses, the one with the fewest assumptions should be selected" certainly suit most situations.