Jeb,
I can restitch any failing seams and put patches over any tears. This would make it usable as far as getting you out of the sun. I would do my best to get something close in color to make the patches. I know I have some white,gray,tan pieces of material laying around. If you want you could send it to me UPS or USPS. I'll do whatever I can to make it usable for you and your family and send it back to you.
I wouldn't want to replace zipper on this top due to the fact that it's probably not worth putting them on it. Just by looking at the top I'm thinking this is a pretty light weight material with a limited life.
If you want to replace the top you can get a replacement top for $215.
These tops look pretty nice made with 9 oz Sunbrella. As long as the radius of the curve on your top matches the curve in the patterning of the top it should fit (i can't say that it would or not). They are a 6' long top and you would have to measure the width of you top to order the correct one. The new top will not have the zippers to attach the side enclosure. The zippers can only be added to the top once it is put in position and marked not only where it sits in height and mounting points but also center line so that everything lines up. The patterning the new side curtains/panels and zipper placement can be done then.
https://www.coverquest.com/bimini-to...s-in-sunbrella