I kind of did the same. I wanted a beach strap attachment point, focus light attachment point and a decent handle so I bent some band aluminium and attached it to the top of my existing tray. Work out well and only $7.
popadiys, you might want to make a box instead of a U shape and connect the ends of the box. It will be much more sturdy and my aluminium is very flexible and would wobble underwater. The box also adds the attachment points I was looking for in mine.
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