As charlie8575 pointed out the basic stock interiors of the day and Fords as well were pretty uninspiring. The materials were also not known to be long lasting and Sears seat covers were a very big seller. Using a '51 Ford that I owned as an example, the dash and the metal window trim were a medium gray with a hint of Silver. The cloth interiors were a rather itchy Gray cloth with a hint of a striped pattern . The picture you're using as an inspiration is hard to date but I think the shape and color of the California License plates put it prior to 1956 when they went to the general shape we see today and had Black letters and numbers in a Yellow background. Should you want to have a custom interior I would consider something along the lines of your very nice looking '55 Ford. Or something like the picture Misha posted. There were seat covers on the market that resembled that and they were within most peoples budget. Not trying to tell you what to do, just trying to offer some ideas. build it the way you would if it was your 1:1 car.