I have put together something similar. I am going to use a 3" Hydro-Force Dredge Nozzle into mine. I made hole in hopper 3 inch, and fabricated a 3 inch hose coupler with sheet metal which I mounted with bolts, so I could hook 3 inch dredge hose to. I go from grizzly to punch plate to expanded metal over low profile rubber mat. And rest of sluice is expanded metal over miners moss. I will try and post a couple photos of mine. Nice job,