This looks a little Gorky but it works. The plywood is sitting on two fenders. There is also two 1x1 pieces of wood to tilt the Mirage to port for water drainage.
Our dock mates told us to use some windshield sun protectors to make the shroud to vent the ac air inside the boat. The hatch makes the top rigid part of the shroud. That's what we did, it took two windshield covers to make the shroud. It is insulation and |Debbie made the shroud by taping the cut pieces to form the shroud\scoop.
This is on another boat and the same thing applies. It helps in the winter and spring but does not keep the boat cool in the hot summer months, the owner said.