The picture shows a dropped rear floor pan of a Victoria. It is common to the 400A and I think it is similar to the pan in the Deluxe Tudor.
I'm not sure about the floor but the driver's seat was on tracks for adjustment and the passenger seat could be adjusted for rake with the rear legs being adjustable up & down to a degree. The seats were very much like the Victoria and Convertible Sedan if not the same. The lowered rear floor pans for the Victoria and A400 are available but I haven't seen any specifically for the Deluxe Tudor. I'm not saying they weren't dropped but I just can't find the information that indicates that.