The bimini does not really create any wind
resistance yet provides shelter from a lot of the elements. As soon as you start adding sides, the wind
resistance increases significantly - something that needs to be considered as the wind increases - especially if you are manoeuvring in a marina!
Zips provide a good way to easily add/remove sections and provide a decent seal between the bimini and the dodger
. Velcro is not strong enough, and the pop-the-dot fasteners are a pain!
I like a bolt rope
slide-in for the base of the front window as again it provides a good seal.
Just make sure that the zip is a large strong and plastic one!