A couple additional points i would note:
To expand OG's comments on the fiberglass, Altec cut and installed it very neatly, factory fiberglass should be obvious, usually doesn't run wall to wall, should be smooth and uniform, not lumpy.
AJS's cabinets are plywood(Altec built them both fully MDF and part MDF/part plywood), the correct plywood, look at the side panel edges at the rear of the cabinet. MDF floor, seems like the cabinets started out pretty close to the 1968 drawing. http://www.lansingheritage.org/image...ure/page10.jpg
The screw spacing on the back panel appears correct(could be spec'd in factory drawing for DIYers).
The mounting blocks for the back panel have been uniformly stained the base cabinet color. This was done on some factory cabs, not on others. Kind of an **** step for most DIYers. But, some of us strive for accuracy in the smallest details.
T-nuts for mounting the horn appear to have had their faces sprayed black when the baffles were sprayed, and have since been turned around in the new baffle and modified horn mounting scheme. But, a stock cabinet would only use 4 if it used any at all for mounting the horn. Also, the paint appears gloss, Altec sprayed the baffles flat or matte.
AJS does mention some artifacts on the back panel, i'd like to see a pic as well as a pic of where the 2 x 2 mounting block was for the driver end of the horn.
The hardware on the crossovers, and the spade terminals are too shiny and clean. They should show at least a haze of oxidation if these modifications are more than a decade old. Compare them to the screws mounting the crossovers to the cabinet.
Something about the end of the port tube where it was cut also suggests that it has not been all that long since it was done.
Not offering these points as proof of anything either way, just pointing out some of the more subtle details that i see/look for.
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