My grandma grew up in Savannah Georgia and we always had low country boil when we would go to visit her family down there. We make it every so often as well during the summer...especially when feeding a good amount of hungry people.
Anyways, I don't know the specifics of the recipe, but I do know my mom and grandma put in whole unshelled shrimp, kielbasa, quartered (depending on size) potatoes, corn cobs cut in half, and seasoned with salt and some Old Bay. All cooked in a turkey fryer in some boiling water. Like I said, it might not be too specific, but I don't recall there being too much more to it. Oh, and don't forget to dump the pot on the table to eat. That's the way we always did it when we visited our family in Savannah. Eatin' right off the table, ain't no other way to eat low country boil!
Good luck and enjoy yourself some good eatin'!