I don't think it's been mentioned but what about fiber optic cable? If you can get it cheap, scraps or leftovers from somewhere, maybe internet... You could have it anywhere and pull it anywhere.
Another thought would be to use existing inside walls studs, for example, if you could use a single inside wall, pick a single run (2x4-16inch space) from roof to ceiling, coat the stud wall portion (the 16inch space stud to stud) inside the wall somehow with tin foil or cheap mirror, then have solatube in the top and in the basement a single diffraction window.
While i'm thinking about it, take a single 4 or 6 inch plastic pipe and cut it in half lenghtwise, glue tinfoil to the inside of the pipe and reassemble.
just a thought.