Hi Rob,
First I appreciated your updates on the 40-footer.  Nice looking!!!

About the self-righting.
Interesting concept, and it started me thinking for a bit.  Please bear with me for thinking aloud here.

I assume this is for Bucket list, which is a racing machine and as such should be able to sail on one hull (or the two leeward ones) much of the time.  With slots for water entry just above your false floor the leeward hull(s) is not able to carry the weight of the whole boat unless it is already foiling.  So you need to get up on your foils well before the ww hull lifts.  For a very light foiler, this may still work, I guess.

Maybe this could be made to work even if not foiling.  If the slots were higher up on the lw hull,  water would not enter the tank until the boat heeled over.  But then the water would not drain automatically after righting.  Slots at false floor level could then be opened by the crew to allow draining before sailing on.  But I suppose the problem here is that the tank may fill gradually during normal operation due to spray and waves.

Would it be better if the false floor (bottom of tank) was not horisontal, but tilted outwards (to lw), so the tank is more submerged when the boat is heeled over?

Rune