That said, it seems like it's likely a lot more expensive than a bank of set top boxes, which would likely be a better choice.
Disclaimer: I work for Vecima networks, but this system does do exactly what you want, and is already being used in that capacity in many other places, including some hotels.
They have a large room with a bunch of military vehicles/artillery as well, spanning from bore loaded cannons to Leopard Tanks and M109 Mobile Guns. Some of these have decent signage (most of the tanks, and vehicles along the outer building wall), while a lot of the stuff in the middle is interesting, but unfortunately not presented with any documentation.
The main galleries, however, are excellent, as described. If you're going soon, there's an exhibit about camouflage that's currently running there, created in conjunction with the Imperial War Museum in London, that was quite interesting. If you're hardcore into museums, as you seem to be, allocate a full day for this one.