Nice job pal!... If you want to keep clay like that from bunching up, a good way is to use flocculent... You can find it at any Walmart or pet store (it's the stuff used to clear the water in aquariums)
Nice I like that little shovel I found what I'm going to use for your sluice now I just got to get some clay so I can make a reverse mold off of one of my mats just going to take a little bit more time but I'll get it to ya as soon as I can anyway 🤘⛏️🇺🇸