So you'd also be voting against the W22's for my room size, as well, right? Hmmmm...
As for your idea, the bottom of the 100" screen is only 29" from the floor. I have an entertainment console to store multiple video game systems that is the perfect height to place the VP150 on top of. I can angle the VP150 upwards, but having L/R that low doesn't appeal to me, especially for the people in the 2nd row seating (whose ears will be approx 42" high). The speaker height issue is one of the good points about mounting speakers behind a perforated screen.
Other considerations:
Where would I get 9" speaker stands... have Axiom custom-build them for $220/pr X 2 pairs? I'd rather spend the money on speakers versus stands... which is one reason why I want try to make the M60's happen.
Every good suggestion leads to more problems... But thanks, anyway! I hadn't thought of doubling the M22's. I've literally crossed out hundreds of ideas to get the point I'm at now in the planning process. It better be worth it in the end!
