That is a primary project here in Florida. I would suggest you shop through an stablished canvas shop that already has the measurements and a pattern for your boat. You will benefit by getting a design that has been optimized through the years. The shop will guide through the selection of materials and provide you with instructions on how to do a proffessional installation. The chandlery here on Hunterowners has such a shop if you want to inquire with them. There are other alternatives like custom made jobs, homemade jobs and adaptations of biminis intended for powerboats. I got to say that the biggest bang for the buck is provided by a fabricator that already has the patterns. Any moneys spent on a good fitting bimini are well worth the betterment of your sailing enjoyment.