Brought all the pieces home and put them together this evening with a bit of help from buddy Mark. First, for Kerry and James and everyone else who was confused about the "hockey sticks", this picture (blurry as it is) should make things a little more clear. You can see the T-bolt at the top - that slides in a mitre track - and you can see the yoke at the bottom, which holds the instrument. The idea was to suspend the instrument directly below the T-bolt and leave room for the biggest peghead of which mere humans can conceive.
I'm still missing one guitar that should be in there - I have to get it back from a friend - but the second picture shows the cabinet in all its glory, lit up with the internal fluorescent and basically doing its thing. I have to play around with the order of the guitars a bit more, but you certainly get the idea.
I'm really pleased with how this turned out!
(Oh yeah, because I know someone will ask, the instruments from left to right are: 1971 Martin D-28, 2007 Morgan CM, 1980ish Fender dreadnaught, Songbird tenor banjo, Ibanez bass guitar, Godin LG electric, Godin A8 mandolin.)