I'll wait until some others try theirs before continuing the fight with the headers.
In the mean time, I went ahead and installed the chips and fired it up. Good voltage leds and the display comes on but seems to scroll slower than in the video and led #6 comes on dimly and stays on. I ran the test and the led's on pins 10, 11 & 12 don't come on at all. I've switched opto's with working ones and it doesn't fix it. Rechecked all my solder joints and don't see anything amiss.
Maybe I'll need to step back and attack it again in a day or so.