FWIW, I went almost to the recipe because I had a good sized martini glass to fill. 1.75oz Gin, 1oz homemade triple sec, 1 oz lemon, and the rest as advertised.
This is the cocktail for the mall rat GenXer. I've been there. For me this was the adult, lemon version of the mall Orange Julius stand. The taste and the texture are right there.