Posted by: rusty125 on Nov-20-12 8:18 PM (EST)
My Nordy was built a year or two before they switched to the plastic bolt-in seat. I cut out the glass seat and replaced it with a foam one a few years ago, and have replaced that one again since.
I do know from experience that if you move the seat forward an inch from it's factory position you will find that the boat weathercocks a little more than normal. If your new seat pan is higher or lower than the original, that will be much more notable on the water.
There really is no right or wrong, as the weight of your kit in the hatches can easily effect the boat just as much as moving the seat an inch to the front or back. You might find that moving it a touch one way or the other makes the boat handle a little better than you are used to.