High output coincidental / quasi coax 3 way speaker concept

Correct, this is strictly using passive filters.

The NE180Ws are very quiet at xmax, but i don't know whether that's the case with inverted baskets. The sensitivity of all 6 running in 3 groups of series wired in parallel (16 ohms / 3 pairs) = about 5 - 5.5 ohms total. Not sure thats enough low end balance for 96 dB/2.8V.
 
Basket side may be noisy, best to check before. Total impedance is just over 5 ohms - very comfortable for any amplifier. Total raw sensitivity will be 96 dB/2.83V/1m at 2pi, but after applied BSC it will be just over 90 dB at 4pi - which is good and above average.
 
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I think it will work fine as a monitor where high fidelity isn't always the consideration but loud focused sound is.

With the woofers crossed moderately low there won't be much blocking of the sound but there may be some kind of phase cap thing going on.

I thought the primary reason for a 'V' shaped baffle was to align the sound with the tweeter, both dispersion and time.

Jensen sold a ton of coaxials and tri-axials. Maybe design decisions should be left to the marketing guys? I'm sure Free bird will sound great on those cranked up to 11!