Good find . I have seen the "alien tech" motor before but i could not understand why the reed switch shorted out the cap !. I have re drawn the circuit ( gives 4 versions ) all of which make more sense to me. Have not built one , idea of using 46 gauge wire put me off .
my calcs were :- 3/8 inch dia core , internal former length 1 inch , winding depth 3/4 inch ( per "side") . This i estimated to require approx 350 to 400 grams of 30 swg wire and 10 grams of 46 swg .