To the OP question about keeping rain out of the cockpit
, we had custom curtains / enclosures made for just that purpose. We had the full enclosure on our first 450 and never used it. If you will be at anchor
or on a mooring
the rain will be coming from the bow so the full sides and back just keep the breeze out.
Neither of the factory Biminis cover this area and the Dedicated Marine
hard top doesn't either. We have not decided to have an enclosure for our hardtop made yet but we went with a much larger Bimini
than what Dedicated Marine would offer so that we can fully enclose the stairs leading up to the fly ridge. Additionally, we wanted to be able to reach the aft end of the sail bag while standing on the hardtop, which you can't do from the small hardtop. If you are interested, you can see our custom hardtop and side enclosures on our FaceBook page to S/V Cruisin' Rhumb.
We also have custom front and back awnings. The front keeps the rain out of the forward hatches and the aft keeps the sun out of the cockpit.