Hey ishallperish
It looks like you've already got your head around the difference between a sluice and a highbanker. Building your own and testing/modifying in the field can be just as rewarding as getting more gold from an already built and tested unit.
There are so many variations out there it's a good idea if you can to have a crack at a few of other peoples units to see what style or features you want in a highbanker.
For example some people enjoy processing the material by hand on a flat classifier and some would rather shovel like a demon and have the larger material fall freely from the hopper.
Some highbankers have spray bars that will clean the mud from your material and some will blast the clay apart.
Good luck and welcome to the highbanker club