I have a 49 and it has two types of upholstery, volta cloth and corduroy. I'm not sure if a 47 is the same or not. I bought the Volta cloth from the manufacturing club and am having a hard time with finding the corduroy material in the right color and pattern. SMS did not have it in stock and said they could make it for $90 per yard with a 3 month lead time. I found a chineese group that would also make it but they don't do small orders. Their min is 80 meters.
I have not done mine over yet but the guy doing the work estimated 5 yards for each type of material to do the seats and door panels. I bought 7.5 yards of the Volta cloth just to be safe. I'll let you know how mine turns out when it is done.