[JohnB]

Tiburon,
Most of the original transoms I have seen are within 1/2 - 1 inch of the corners. On mine, I am probably going to put 2 layers or reenforcing glass in the corners, so I will probably come out about 2 inches from the corners, then put the coring material in, and come back with 3 layers of glass on top of the coring, and into the corners. With there being a bracket on my boat, and a plate/beam on the inside, the corners are going to load up, so I am going to hit them hard, and also put in knee braces to the floor, and kick braces to the side (if I can fit them in).

If anyone knows a better plan, let me know.