Commercial sluice to fit

When I was younger    I had a sluice made of galv iron, about 6' long, that I would carry up creeks and just drop in the stream. It worked well, as with a decent flow I could feed it straight from my working area. No classification unless the rock was too big for the shovel. [lot of gold on some of those really big rocks]
Now the years are catching up and I'm researching a smaller, lighter sluice that will serve my purpose. I still have a problem with classification before feeding the box - I want to just shovel it in and let the water take the small stuff and rake out the big 'uns occasionally.
I've looked at Jobe and McKurk - are there any others worth a look?
Maybe there are custom made models available.
Any info would be very welcome.
Heavy pans to all.

I like the way ya thinken Longbob, but alas, she'l need to be a home brew for what ya fetchen