Our barbox is in the basement. and I'm just short of the space to use a full cue at every possible angle. The room is about 12'4" by about 20'. For shots perpendicular to the long rail, and shooting with the cue ball within an inch or two of that long rail, we have a short cue. I bought a weighted 48" cue, but we could probably use the 52" cue just as effectively. For any other shot, your regular cue works without issue. The weighted short cue isn't perfect, but it is the best possible fix for not having to jack up your cue to shoot.
I agree with Mike that some structural modifications will be needed if you want full unrestricted play, but the short cue really isn't that bad, and for my space, it gets used fairly infrequently. Another option is a six foot barbox. Those make the game more about position and cueball control, which translate well to larger tables.