I think doing the seat inserts in red would be very nice and the oval door pieces in red give a nice touch, its classy and not overdone.

My door pieces were $25 to do each oval and that includes material cost, it only took an hour for them to do mine and my total cost was $100 for all pieces done. That can give you an idea of a price to look for that is a fair price.

I definately think you should ask a interior shop are painter to do the ss logo in red, that would be a nice touch in the trunk and that shouldn't be expensive either, should be like $50 to $100 to do that but closer to $50 I say, just shop around for a good price by a good place.