My understanding is the B52 interior was modelled (guessed) on the B29 layout, plus some creative stuff. I may be wrong. Also, I may have some faults, but being wrong isn't one of them.
Why base the layout on a B-29, when a pretty close guess of the cockpit layout was published in Flight Magazine in 1957 (for the B52C). The EW/Gunner/Nav and Bombardier station instrument layout may have been based on the B-29 though. co-pilots station had a photo of it as well in the same issue.
flight oeing | drawing depicts | retroctio tte-bor | 1957 | 1684 | Flight Archive