We manufactured 14, 16, and 18ft cats in the late 70's and early 80's with spinnakers as viable options, and I have to say that the difference in rigging them with or without spinnaker, when you were familiar and comfortable with the process, was only the difference of no more than ten minutes. The extra lines on the deck was only minimal and never a problem if a little "good house keeping" and thought was used in the set up. It's a bit like the difference that I have seen between one sailor setting up his boat on the beach and taking an hour to get it ready while another with the same cat hits the beach and is ready to sail in about ten minutes. it seems that although we know what the horse is like, it's the jockey that we are uncertain of. (although I do have to say that as a personal preference, I like a cat, cat rigged and as "clean" and simply layed out as possible, sailed one up, there is a purety in that form that is hard to deny)