1930 20 ft Model 100 Upholstery

[Jim Godlewski]

Does anyone have any guidance on what the upholstery looked like on a 1930 20 foot model 100? I have some seatbacks although they are not original, and they really do not look like a factory set. I understand the upholstery on the front seatback does come up on the backside like the photo shown. I believe the bottom cushions are separate pieces but not sure on how many and if any piping was included or any other details. Thanks.