window sill pan question in new construction install

Hi:
I having new windows (with integral nail fin flange) and siding installed. I was just going to have the sill wrapped with something like DuPont membrane flashing but see there are rigid sill pans on the market. The windows have already been ordered based on RO measurements (minus 1/2" in height and width) so I'm not sure if some of thicker rigid pans will work at this point (like SureSill). Is membrane flashing acceptable or are there thin sill pans that would still work? I see Dow makes a very thin sill pan called WeatherMate.

Membrane flashing is definitely acceptable.

Youtube has a ton of neat videos on this process utilizing different products and methods. Some are really good as they are from the manufacturer of the products.