How's the form?
We recently replaced the cushions on our Hunter 340. We changed the style and upgraded the type of fabric, but the best thing we did was upgrade the foam. This made the seating more supportive and much more comfortable. Often the original foam is a poor quality that is meant to last about 4-5 years. While it looks thick, it is not dense and when you sit on it you really sink in and there is no firmness. I encourage you to look closely at the foam and try to determine if it is worth reusing. There are some great internet sites where you can buy high quality foam if you want to do the job yourself. As for the covering, we went with a soft imitation leather that looks beautiful and you can easily slide across it if you want to move across on a U shaped dinette. With cloth you tend to stick more if you want to move across. While I know you don't have a dinette, it is still good to consider how you want to use your cushions and what type of surface you want. Enjoy the decision making process since that is part of the fun - no doubt whatever you use will make a huge difference on the look of your interior. By the way, if you do the foam yourself, a GREAT tip for cutting it is to use an electrric knife. Nothing works better or easier when cutting foam. It gives a nice clean cut. Rob