Larry, not trying to diss what you have said here, but a couple of things from my research over the years: The pics you show of the fastback 88 and the 2dr sedan show the very same door, up to and including the upper window framing. Second, if I am hearing you right, you are saying that the windshield glass on the station wagon is itself taller than on the sedans and coupes? That's pretty hard to understand, given that in any automobile body, the firewall/cowling/windshield frame/A pillars is the single most expensive part of the body shell, and next to the engine, the single most expensive part of a car (certainly from the 50's and 60's--source none other than the late GM stylist, David Holls, who was in GM Styling at the time the '49 GM bodies were being styled--I knew Holls in his later years, BTW) Even harder would be to feature that for 1950, the station wagon was the lowest production body style of all, and yet it used a taller windshield glass?
Or, do you mean there was a lower roofline on the fastback vis-a-vis the coupe and sedan bodies, and that the station wagon roofline was taller than any other Olds body that year (that is true, of course). I know the convertible and Holiday hardtop had a lower windshield, but I would be interested to see the camparison from say, a windshield glass exchange manual--that to me would be the definitive source.
interesting hypothesising, but there are indeed four different windshields, in descending order of height: station wagon, coupe/sedan, fastback and hardtop/convertible.