Thanks, Everyone. After further measurements and considering the various use cases (and reading a great thread on the 100's forum about the ARB drawers) and, most important, testing the WAF I am going to go ahead and do this. If, that is, Slee can get me what I need and get it installed in time for an upcoming trip.
I plan to go with a single drawer with the ARB1176 (w/ roller top) for the driver's side. That will allow me to sleep using the wider side of the 2nd row and also, if I throw some cargo on top, will put that higher, rear-window-blocking cargo on the left which is where I prefer. No plans for a frig as our camping use will be minimal, mostly one-nighters. This will allow me to install the right side 3rd row seat if I need it and/or use the right side for a cargo box and other "stuff". Once it is done I'll post pics.
Now I need to determine if this is going to push me closer to upgrading the suspension. For now, after talking with Slee, I am sticking with the stock suspension to let it wear for a couple dozen or more thousands of miles.