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You didn't start building this thing yet?
I don't really want a helix. Simple as that. Not trying to be a jerk about it...just not interested.
And yes, it would in fact change the footprint because these curves are already pretty sharp (around 19-20") and to drop a helix in the middle of that requires either a tighter inner radius (no-go) or fatter peninsulas (also no go given the space).
What kind of materials are you planning for the benchwork and scenery base? Wood, steel, shelf-mounted, floor supports? And for fascia? What about lighting -- a valence or rack lighting or LED strings? For Colorado I assume it's open grid benchwork but there are other options. Planning a good structure for the layout is important. Seeing as you are an HCD man and this layout definitely is not, it's something to think about.
If it's any consolation a duck under can be as convenient or inconvenient as the builder decides to make it. My 90* 24" radius sectional track that I built to be hinged has been wonderful. Reliable, no derailments and easy access to the "pit" which was a design criteria for my build as I have had multiple back injuries. If you can live with less run I vote around the walls. I am not sure if it would work for your space but if my similar (11x13) sized room was just a train room and not serving as our living room I would have built around the walls with a peninsula. Need to watch aisle width but with careful planning could be perhaps a workable compromise (and still not create any difficult to access trackage)I realize this is standard gauge HO but something like this gentlemans layout should be able to fit comfortably and perhaps be the best compromise in terms of general shape or design of bench work/layout.http://model-railroad-hobbyist.com/sites/model-railroad-hobbyist.com/files/users/rtw3rd/RRR_Lance3-720w.jpg
Given the size restrictions, I think a cockpit style will give you the scenes and vistas that you are aiming for but with swing gate access. this way there is no duckunder issues. If you do the duckunder, then the layout should be high enough to minimize bending (but sometime you're going to whack your head no matter how you try not to) or set up so you can sit down on a rolling chair and scoot under without bending your neck. I'd plan on well padding the duckunder "roof" regardless.
I'm amenable to a swing gate or lift-out also. Just sketchy on the engineering (alignment, power, safety stops, etc.). I would actually prefer that to a simple duckunder.