That really sounds like a funny project...
BUT if he is a good shaper, all you need to give him, is info about your self eg. height, weigth, level of surfing, conditions and what you like in a shape. Then he makes a board specified for you.
If you want the Skater (which is a damm good board imho - so I fully understand your choice) then you need so many infos that you have to have the board in your hand to make a copy.
Photos and data of course will help you down the road, but the chance ending up with a Skater is 1:100000000
But like I said. Funny project. Good luck