Altec Stonehenge 1 build

So I was given an empty set of Stonehenge 1 cabs that need refinishing but are fully intact and not too bad. There are no drivers, crossovers, or emblems. Just the grills. My question is whether or not someone here has tried to fit an H91 horn and compression driver in there. Or a 2305 horn? I could use JBL D123s that I may be able to get my hands on. Anyone ever tinkered with this? Is it worthy to try? :dont-know: I can't measure them right now as they are in my storage unit due to the fact I have way too much sh$t at home.