Here is the video of the assembly of the perch. It went smoothly which is encouraging news for the new measuring and drilling method.
You'll notice in the video that the joints are more than a tight fit. They are what I call a hammer fit. I aim to make the tolerance between the mortise and the tenon between 1 or 2 thousandths of an inch. It may take some getting used to driving such tight joints and learning to make corrections while doing so (once driven even partially home, the joints are near impossible to twist), but I feel that the results warrant the extra attention.
Here is the link to see the video direct on Youtube.com