Tay,
Don't know if this will be of any help but on my 2004 MY 2400 SC3 everything attaches to the bimini.
The enclosures for my boat consist of 4 sections: the forward enclosure between the front of the bimini and the windshield, the sides panels, and the rear slant back enclosure. None of these bits have their own frame, they all hang off the bimini and it's frame.
The front top edge of the front enclosure zippers onto the front top edge of the bimini and the bottom edge snaps onto the top edge of the windshield frame. The side enclosures, thou not rectangular, have 4 sides; the top zippers onto the bimini, the front zippers onto the previously installed front enclosure, the bottom snaps onto the windshield frame, and the rear will zipper onto the rear enclosure. The top of the rear enclosure zippers onto the rear top edge of the bimini, the left and right side of the rear enclosure zippers onto the left and right rear of the side enclosures, and the bottom of the rear enclosure is held on by snaps attached to the hull.
I think.
Dan