If I were you, I'd try catching it. Apparently it's worth almost $14,000!

1) Short answer is "yes." A small distance outside of the clear aperture may also be effective. In the case of my Wolf Pro Island hood, I count the inch at each end and back, but not the higher curved part that adds to the specified dimensions. I count an inch of the light bar zone also, which is significantly larger. This is really in the noise, though, given the ability to estimate baffle pressure loss, among other things. 2) Not me. 3) It doesn't help if containment is perfect (which is our goal) if some of the effluent plume is not captured. To the extent feasible, determine the contour of the largest pans you might use on all your burners. Determine your hood height above the pan bases and multiply by the tangent of 10 degrees. (This is the minimum; somewhat larger angles can be argued for in various circumstances.) Extend the outside edge of the pan contour all around by this height x tangent value. Your hood capture area should encompass this larger area. In your case, the back is a wall and the hood need not go any farther. Larger containment volumes (significantly larger than residential hoods provide) allow averaging of the highest velocity plumes over the baffle space allowing commercial hoods to get away with somewhat lower CFM for a given capture aperture area. 4) @opaone's noise charts. I don't have an iphone to use to contribute values with. If you use an external or in-line but distant blower, and install a silencer such as Fantech makes in the path from hood to blower, the blower blade tip noise and upper duct turbulence noise will be significantly reduced. My roof-mounted Wolf/Broan 1500 CFM rated (at zero static pressure) blower pulling an actual ~ 100 ft/min across my hood capture aperture is fairly well attenuated such that the dominant kitchen noise in the voice band is baffle hiss. This might vary with baffle design. 5) I can't answer specifically, but with my hood blower on full power one can converse at normal talking level with someone on the other side of the hood or a few feet away. From the cook's point of view, Intelligibility of a TV in the open room on the other side of the peninsula requires a modest volume level increase over listening with no blower flow. In my opinion, find a hood that best solves your optimization of the trade space of capture, aesthetics, cost and use an appropriate remote blower with a silencer, and you will find the noise is attenuated enough. If you follow the general "prescription" of @opaone's commercial setup, you may be able to run lower flow rates from a large enough blower that the noise is negligible for most cooking tasks. Opaone has discoursed on this in a number of threads that should be reviewed. 6) The more the hood design approaches a commercial configuration, the more volume below the baffles you will have. See this thread for a relatively practical quasi-commercial solution. https://www.houzz.com/discussions/6204496/range-hood-questions#n=8

Wonderful abundance! Sitting quietly in a garden has to be one of the best ways to start the day. Your third pic reminds me I have a hammock stored somewhere ...

I like your patio structure, turned out very nice !! Yes, gardening is a never ending evolvement as plants outgrow their allotted space or we just tire of them and wish for a change, there's always so many new and beautiful perennials and shrubs being released! Continue to enjoy your place! Oh, all those street and yard trees sure are growing up nicely! :)