Your measurement ideas are perfect Ckat.
Use 3 coops of Portland Cement in any container chosen as a gauge to 1 part of any material of your choice out of graded Peat Moss, Vermiculite, Perlite or even course sand and blend to that thick cake batter and success is assured;.......................unless you don't spend enough time saturating the fabric with multiple tosses and turns, let it set and do it one more time then you think is necessary for good measure......................
Create!
Where are my acorns?......................................................
