Re: Upholstery Framing
I bought an entire interior from the manufacturer for probably less than what it would have cost to have mine reupholstered... including bucket seats, and all the backing / framing made from kingstar composite (won't rot - ever). Never, know, might be worth checking to see if there is an option to have the factory do it.
I also have sewn marine upholstery on a regular sewing machine making stripes, etc... without a lot of problems. You would be surprised how well you can do with even a relatively elaborate interior if the old is in good enough shape to use for patterns. The welting, fabric, etc, etc... is available from upholstery supply houses...