I ran a charter
boat that had a huge (15x15ft) cockpit space, and what was effectively a "roll cage" of anodized aluminum
tubing that was strong enough to support the boom if the topping lift
broke. It had a set of 1 1/2 diameter aluminum
hoops and cross bars, 2 on each side, 2 on each end that were welded together, with a radius, probably 2 feet, bent into each of the support posts.
Over the whole shooting match, heavy grade white vinyl was stretched and held taught with truckers hitches. The Vinyl extended down just past the radius ed portion of the support posts. It worked well to cover the area and be able to withstand a decent blow. It held on when a glancing hurricane
and a 70mph squall came through. It was also nice because we could untie the corners and tuck them back to make it easier to get in and out, whichever side of the dock
we were tied to... Which is my biggest gripe with most bimini enclosures, you have to tuck down into a ball to get under them.
What I'm envisioning is wrapping the piping up in the roof, and wrapping around the outside poles. A sleeve and zipper to connect isenglass panels. The "roof" won't be wind
tight, but with a turned down edge of the vinyl roof it would keep most all the rain out, and be left in place as the isenglass panels would be a totally separate entity.
When you want it gone, unzip it and all you have is a fixed frame. It looked a bit industrial without the vinyl top on it, but I've got to say it beat any of the small stainless fold down flimsy bimini's I've used in the past.