Haven't even got my 18's yet for my main subs build, but new elec recliner coming Tue and have just been measuring and due to the width it's going to have to be moved further forward than the current sofa (shame). That's going to leave a whole new space to explore, and I'm thinking of making one big enclosure the width of the sofa (2m) approx 35cm deep and 80 cm high. Needless to say it couldn't just be that easy, there is a radiator to incorporate, so it will have to fit round and on top of that. It is in the middle of the sofa at least, so each side of the radiator will have the deepest bits and I was thinking to have one driver in each facing the sofa back. I can turn off the radiator if necessary. I will have a play on sketchup, I can make it one internal volume or section it internally to maybe make one enclosure each side per driver. I have no experience of drivers suitable for nearfield, obviously the depth is the main issue, with only 35cm external they need to be fairly shallow drivers. I'll start calculating internal volumes when I get a min.