Very good choice and great start. I have a PR60 and an very impressed with it. I too have thought about doing a replica of this unit but with some changes. I think Meadoew Creek make a great chicken cooker as well and I think it would be very easy to combine the two designs into one with two separate rack assemblies to be used independantly depending on which one your cooking. The unit could be used to cook a lot of hamburgers, steaks, flipped chicken, butts, briskets, ribs and of course a pig. It would serve ever purpose you'd run into for volume cooking.
Good luck with your build!!!