Steve,
I have a 1951 and made my own bases as seen in the photos, they are probably not good enough for the rivet counters but work very well and are generally comfortable.
On the Bases, I used Timber (Mountain Ash/Tasmanian Oak) 50mm wide and 19mm Thick. The Bases overall dimension is 430mm X 430mm (17" X 17")
On the base I used 100mm Thick Medium Density Foam. and 40mm Thick Low density foam on the Backs.
The wife sew up the material, (I know its white, and believe it or not it is easy to keep clean)
I can take a photo of the underside if that helps.
Regards
Wal
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