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To the OP
I've done self leveling fills as deep and deeper than yours without adding plywood. I add a liquid strengthening additive for concrete to the water when mixing (75% water 25% additive). I'm sure home depot sells this. I've never had any cracking in deep fills by doing this. I assume the guy in the above video is using additive because his fill is about as deep as yours. I use my laser but you can get it close with an 1¼" reference line snapped on the wall. After the pour has set, fine tune with Henry's portland based patch and skim coat checking with a straight edge. And duct tape stuck to floor and wall around the perimeter works fine as a leak dam.
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