Dave: I struggled with the same problem and decided on the newer aluminum frames with a thin skin of fiberglass on top. These types of tops are very light. The workers easily walk on these but you have to be careful. One thing I would caution is to really plan out the placement of any antennas you want to put on top. They can easily weld in plates for these items before they install the fiberglass but it gets more complicated afterwards. Also plan for a path for the wires. I also eliminated the venturi windshields for a cleaner look. I had mind done by C and C Welding out of Cape May and they did a great job. The EZ2CY is great stuff although the price takes your breath away. Frank Burrows Destiny 1979 43' Viking MY Piney Narrows Chesapeake Bay >My biggest concern what effect this extra weight will have. There are two >options, the first is a heavier and stronger top that can be walked on, >which requires more structure, verses the option of a lighter top and >structure that can't be walked on.