I've seen at least "for public presentation" versions of such computer imagery, which show how human beings--or at least dimensional outlines of their bodies--"fit" in cars, airliner seats, and so forth. But it never hurts, as you wrote, to try out real people in a real, solid model (a mockup), to make sure that limbs can fit into spaces without a person having to be a contortionist.

My only sorrow regarding jetliners--which I'm sure cuts no ice with the accountants, but to me is an aesthetic loss--is that they all fit just one "formula" now (a cylindrical fuselage with moderately-swept wings and tail surfaces, with two wing-mounted high-bypass engines), while T-tails, rear-mounted engines, low-bypass turbofans (I remember *turbojet*-powered airliners, like the Convair 880 and early 707s and DC-8s) and three- and four-engine variations become rarer as those aircraft are withdrawn from service.

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