Well the basic problem is driving a 12" woofer to 1.5 KHz. It will be well in its break up mode by then.
I would say you could go ahead with this if it is purely a cinema you want with the vintage cinema sound. If that is what you want OK. If not don't go in that direction. I don't think this would make a good music system if you want to use the room for that also.
I think the jumpers produce a flatter sound for PA work. However because you have that woofer driven up that high these are never going to be really neutral speakers. In a large space this is not such a pressing issue. High sensitivity and good speech clarity was the order of the day, even of that speech sound defined the cinema from the twenties to around the era those speakers were made.
As I said before Altec Lansing defined cinema sound with their Voice of the Theater systems back then. Unfortunately there are very few of these rigs left now.
Some people do look for them despite their size as they are nostalgic for that vintage cinema sound. JBL had their systems too, but Altec and Westinghouse before them defined cinema sound. The latter were massive horn systems with gigantic electromagnets.
Really before proceeding any further you need to decide if you want a modern or retro system. I can understand why someone would want a retro system.
You can see one of those Westinghouse speakers at the back in the picture, it is just right of center. It is in the Pavek Museum of Broadcasting, St.Louis Park in the Twin Cities MN.