My first OB project was with a driver that wasn't intended for OB.  It was 5" but sounded pretty good with a sub.  So what you are suggesting is intriguing.

It would have to have the right QTS to be able to reach down to the sub.  I've never looked to see if any small drivers offer this.  I'll take a look to see what the QTS is on a couple of drivers I have lying around.

Nice!   Are those Fostex?

Size wise those look good. I did a brief search on Madisound and was able to find a few 3-5 inch full range drivers in 4 ohm that were decently priced for experimenting. Definite floor standing which the height would need to be worked out but the premise is to be able to sit in any type of chair and move these small units to a position that yields the preferred imaging. I am stuck on the 4 ohm currrently since my sub is 4 ohm and now that I think of it the size of it with a pillow on top would make for a great ottoman while listening. hah like sensurround used for the movie "earthquake" from the 70's. That shook the good ole hometown Roxy theater in Northampton Pa back then. My main concern is will experimenting with a cheap driver skew the results of obtaining image and depth.

My original design thoughts were 2 separate thin towers perhaps about 30" and just  bit wider than the driver. Using wood to provide a good solid support for the drivers. However your lamp idea is interesting and would provide infinite adjustment. One for each side and I would think depending on the weight of the speaker and baffle it could work and look a it more high tech as well. Hmmmm.

update?

I have an interesting update.
I guy who works for me had been showing interest in audio, enough that he went out and bought a cheep cheep Chinese tube amp ($150).  Tonight after work he brought his little amp over to try out with my stuff.
It was funny sticking interconnects that cost twice as much as his amp into it.
We started by playing my OB's (nicknamed Angie's) with his little amp, it held it's own, it just lost a lot of power and precision that my Torii has.
We then dragged my MG944's out of the corner and hooked them up. It was a nice polite combo. We then hooked the Torii back up to the 944's, big difference, just more better.
We then hooked up my OB's to the Torii. I haven't ever played the 944's back to my OB's.
I hate to say that my OB's sounded really really good, better than my beloved 944's. By a pretty big margin.
I know that those are some fightin' words. Bob makes magic boxes, and believe me, I'm a hack at best, but I've hit on a combo that works.
My co-worker was just raving on how well my speakers sounded. Though he might have been buttering me up because we loaded up the 944's in his car for a ride over to Springfield. I'll let him borrow them for a while, then I'll talk him into trading up to a Decware amp so he can hear the truth!
It is good to be able to let someone get a little joy from something that sound as well as the 944's do.