Hi all and Happy Monday. I have a squaring issue. I am building a ladder style base that is is made of 3/4" ply laminated to make approximately a 1.5" thick member. The two sides are approximately 71-1/2" and the cross members are each 35" wide. Everything is held together by pocket screws. This is the second one of these I have done. The first one came out perfect when I measured the diagonals but not this one. There is a 9/16" difference. I can set up two Bessey clamps and pull it square, but I am sure it wont stay that way, Below is a pic of the "ladder" and how it will be used as the base of a Paulk inspired top. WholeView.jpg Please help me understand what I am doing wrong.