Green-meanie, thanx for sharing the pix of yours. You must be quite the welder and metal-fab professional !
It's true that some small earrings, charms, etc.... won't pass through those holes. Versus the standard sand scoop size openings/mesh. However, the amount of agitation it's going to take to get the scan through your smaller holes, will begin to get tedious.
Perhaps for locations where you dip your scoop under water, and the water helps the sand through the holes. But for inter-tidal wet sand sifting , away from the water's edge, I can only imagine the extra muscle it's going to need, to shake all the sand through your smaller holes.
99% of the targets we seek are caught by the standard baskets. The holes are designed to catch 1/2-dime size and up, for instance. But there are 1% of the desirable targets that fall through, forcing a guy to his knees to finger through the tailings trying to get it.
I knew a guy who saw a one dollar gold piece fall through his scoop. He scooped again, got it, and shook it out again. And again he saw it fall through. The 3rd time he attempted to get it and shake out the sand, he got caught in an ebbing wave that had rolled up around his feet. When that roiling water receded, it must have caught the coin, and rolled it back out into the surf. He could never find it again . Aarrgghh.