I can do walls constructed of 2 perimeters in TOTAL
And 4 perimeters in TOTAL too.
However all attempts to create a 3 perimeter wall result in 2 perimeters with GAP FILL.
I guess Simplify seems to think that the inner perimeter needs to go in a full loop ("there and back") or there is "no room" for it.
Well my suggestion / request is allow for Simplify to slice 3 perimeter (TOTAL) thin walls.
