Home sluices:
This one started off as a drop riffle design, kinda evolved into some kind of hybrid. I like this one for sampling now because cleanups are so fast and easy. It also catches very fine gold. Think of this sluice like a series of cracks in the bedrock, and that's basically how it works.
More homemade sluices of mine, the 2nd one from the left is my main sluice. It catches really fine gold and doesn't let it go. I used to use the carpet sluice behind it, but since I have switched to running home depot's blue grooved carpet in my main sluice, the 2nd sluice cleanups never have any gold.
Another angle of them, the small sluice on the far bottom right is a black sand separator that has magnets from harbor freight below a Plexiglas tray for easy black sand removal.
Here's a close up of the small sluice, this goes in front of another sluice and you feed the material into the tray to catch the black sands before it loads up the main sluice. The Plexiglas has steel glued to it with gorilla glue, so the magnets hold the tray down.
Here's my two bucket classifier with 2 and 4 mesh screens. This thing sits under water in the river while I shovel pay dirt into it. The two buckets are locked in place with a bar underneath so they cant move. When the buckets are full you just pull out the bar and the buckets release.
I'm sure I have more DIY stuff but that's all for now.