Another route is something like this.
https://www.boatcoversdirect.com/products/bimini_tops/Here's mine.
Mine is fixed mounted with the telescoping poles securing the rear. I wanted the top to mount this way for storage while trailering. The original mounted like yours except it was a fixed pivot rather than slider mount. You can still use the sliders and eliminate the tele poles and just use straps on all four tiedowns. You'll need a different (swivel mount) for the slider function but it's all very doable.
Are the frames and material top grade? No, but I've had mine for some time (this photo is from 2012) and it has held up well and does what it was intended to do. It has stretched out some so it isn't as taut as it once was (but who is). You will need to know how wide it is between the sliders and how long you want the top (front to back). You assemble the frame and covering at home so again, the frame isn't the heaviest gauge and is in several pieces. I believe they offer stainless as well as the standard aluminum.
Just another option that has a good price point and has (for me anyway) held up quite well.
Good luck.
