Thanks to everyone who responded. It's interesting to hear what you have to say. 'Much obliged. A few quick responses:
The work is being done by a subcontractor of our main contractor (CWC), so I can't remember their name. I have seen their work elsewhere, however, and it seemed first rate. Believe it or not, I already bought the Karastan rug that will go in the room. A local store had a good sale a few days ago, so I jumped on it. It will cover the entire space between the speakers and the sofa. In fact, if I wanted I could easily put the speakers on the back end of the rug. I wouldn't use the spikes, however, since they would still be likely to scratch the new floor. I have seen people in similar situations place their spiked speakers on, for example, wood blocks--or even bolt them to wood stands--but I didn't know if this kind of thing was in any way preferable to just using the standard Summit (flat!) feet.
This room is going to be beautiful once it's all put together. All the furniture is Stickley mission in Onondaga finish. Like a lot of you, I have had to make some compromises since this is not a dedicated listening room. I will have bookshelves behind the speakers, but they are open (no glass doors, in other words, which look nice but are a sonic no-no) and will house LPs and books. In my experience, this works as a pretty decent background to these speakers, absorbing and dispersing the back wave fairly well. Yes, I realize that it is not perfect, but there is no way that my wife was going to agree to not using that wall space for anything but sound-absorbing/dispersing panels. Also, there is really nowhere else to put hundreds of LPs without them being in the way.
None of this is going to be ready for some time, but I'll submit system pics once it is all in place. 'Going to be very, very cozy. 'Just wish I had a fireplace in the same room...
Best wishes,
Craig