Pictures and Replies
knotscott and dodgeboy, no added zeros. I used a machinist's dial indicator for the arbor runout, for the fence alignment and for the blade-to-miter alignment, accurate to the one thousandth of an inch. Except for the arbor runout, this was probably excessive. When installing and leveling the wings, all I used was a straightedge, until I couldn't get the front of the darn wing to set flush with the front of the main table. I took pix and measurements to HD; they get serious kudos for helpfulness.
Armchair, I don't think the dial indicator is needful except on arbor runout, especially for people with reasonable eyesight. But mine was 20/700 prior to two corneal transplants, 3 more corrective surgeries, and a hard contact, so I don't trust my unaided vision.
Domer, the miter slot seems okay to me, but I've heard of the problem before.
I'm not crazy about the two-piece front and back rails, as I noted elsewhere. I planed a snug fitting wooden insert for the front rail, and added a 48 inch by 1 inch by 1/8 inch thick strap to the back rail, as noted before. I hope they show up in the pictures. "O" indicates the original rear fence bolt holes (two in the main body, in in each wing), "B" indicates two additional bolts added outside the wing, for stiffness.
Pictures attached (I hope!)