Oky Doky...I just talked to a local generator company. They say it is legal to have the interlock such as the one in the picture. However they only install #10 hard wire inside the box and wire through the sill to a the female outlet with the twist lock plug going to the generator. If you want a switch it is primarily for the convenience that I mentioned.
So there are two sets of ideas going, which is why I suggest a professional install it and she is covered.
So I'll eat half a crow on this one and call it a day!
