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I don't see many manufacturers offering them.

Carver, Westland, Taco all offer aluminum.

The Mills bimini on my Outrage 17 came with stainless steel tracks. The aftermarket bimini on my Montauk 17 included aluminum tracks.

While stainless steel would be nice, aluminum would be fine and less expensive.

In reviewing the download, I personally, would NOT use the well nuts. I don't think they offer enough strength to hold the hinge. I say this having had my bimini tracks ripped out on several occasions (Montauk and Outrage) due to rough seas.

I would suggest using the hockey puck method for adding reinforcement to the hinge or track screws.