Hookup, is the zipper at the top sewn onto a piece of kedar strip that uses the original track? If you can sew .040, might it also hold a snap, without all the fabric blocking the view at the top of the windshield? Where are you guys getting Makrolon? I would love to have a sample if you have any remnants.
We need a pic with the contact paper removed.
Glacierblase - A little background first. I needed a new enclosure in 2018 and decided to buy a sewing machine and do it myself. I have an engineering background and looked at how dozens of boat enclosures were assembled before doing mine. I only do work for myself and maybe a small projects for a friend/dock neighbor (I'm too slow t make money!). My first upholstery project was so-so (I wouldn't pay for it) but my first and current enclosure was excellent pro quality.
The zipper is sewn directly to the kedder strip, three pieces (left side 1/2, front full and right side half). These strip float and can be removed. The enclosure has a full border of Sunbrella Marine Navy that is sewn to the Makrolon. Note that the Makrolon is attached to the border - not to the kedder strip or down to the snaps on the bottom. All Sunbrella attachments.
On my boat you don't need the visibility at the top because of the hardtop structure. Its more important at the windshield line. I worked to minimize it but next version will probably be to track the windshield and increase the border on the top (glass rubs tower legs).
The Makrolon could easily hold a snap but its best to have some fabric to deal with small alignment issues.
I get the Makrolon from Trivantage. I have a unrelated business but was able to use it to setup an account. Its about $110/sheet for 52x110. I have a warehouse near me so no shipping which is huge! You can order Makrolon from Home Depot but 4x8 Its (same stuff). PM me your address and I'll send you a piece. I'm putting the enclosure up this weekend - I'll put a photo up.
You will find that all the new center console boats are going to a tempered glass (durability, clarity and easy to clean). The big sport fish use Costa Clear with uses acrylic panels. Acrylic is clear but doesn't bend and can't be sewn. Makrolon is a great choice. Some complaints of "rainbow"'s but it's not a big deal.