To add to what Steve said, The bow has a 39# pull at 28 " You need a string about 4" less than your AMO length. If you have a custom string made, 12-15 strands will be adequate. His advise about the shelf is worth heeding, Your arrows will fly better if they are launched from a single point on the shelf. If the shelf is radiused (arched), it'll be easier to do, if not, build it up as he said.