One question, Jon... On your second VNAV approach video, you showed a demo where you extended from the runway threshold fix, and mentioned (at 10:49) that a good time to turn base was when the vertical path deviation scale showed the aircraft being 1000 below the profile. And on your demo, you had the sim paused for a while with the vertical deviation showing 1540 feet below the profile.
I tried that on a downwind leg on a return-to-land circuit, initially with the downwind leg on HDG SEL. The FMC showed me NOT ON INTERCEPT HDG, which I understand, but the vertical deviation scale was missing. So I couldn't use it to determine when to turn base. It wasn't until I was already established on base that LNAV showed me the vertical path scale and pointer. Did I set it up wrong?