Here are a few pics of my sifter. It is made from a 23 diameter poly drum, is 4 deep , with 7/32 holes drilled in the bottom.
I used a 4 ":beerbuddy

ss noodle for flotation. I use chaffing gear where the ties go, and holes drilled in them for the ties to go through. The first sifter I made did not have the holes in the chaffing gear and the ties kept slipping off no matter how tight they were.
Marine epoxy was used at the joints and special chaffing gear made at that spot with a band in the back to support that joint.
I made a place to accommodate my scoop at the top of the sifter but must admit I never have used it. I use 2 pounds of lead sinkers on a 4' para cord line to keep the sifter from drifting. I also use a 3' lanyard to attatch to my belt.
Many of the things I have done are not neccessary but I made this to accommodate my hunting style.
It is important to use a white shifter , it makes finding the target much easier when you get our age. LOL
I do not use the sifter when hunting in sand but it is a huge help when hunting in rocks, shells, gravel, mud and etc.
I hope this give you an idea of what is needed in making a scoop.