So Nutsy,

I guess you came up with enough research to back your point. I'm tipping
my hat to you, and honoring your answer.

Your point and serve!!

However, I don't think you can seal the Cabin due to vents, bilge limber
holes, shower drains, etc. I've sealed my engine area by using "Pampers"
but the rest of the bilge is connected. Will it support combustion? I
don't know? I do vent the Pilothouse when I use the "Heat Pal" alcohol
heater to maintain oxygen level.

I have to defer to your point of view. So, I give you; Check and Mate.

Ole Thom