Well, the risers worked out pretty well and were extremely cheap. Two sheets of 4x8 1" insulating styrofoam for $20 and the paint was already here (same color as the shelves and eventually the walls in the rest of the basement). It's not perfect and it was a bit hard to cut at times in terms of getting a really smooth edge on the cuts. The styrofoam tends to be a bit rough if the edge isn't sharp enough and starts shredding a bit. I'm not 100% convinced I love the idea, it's really solid but it does what I wanted it to do and you can stick things directly into it as well which is a plus.
So I proceeded to haul out the SW 3.75" stuff and get thoroughly depressed

Honestly, I thought that I'd be able to get the loose stuff all out on the three shelves - prequel, OT, vintage, bustups and Kubricks. Hah, fat chance! There's nothing in the collection I truly dislike or feel all that bad about buying (JarJar and Ewoks notwithstanding) but a big chunk of that stuff has got to go. I really am not all that keen about it, but I'm going to have to pare down a lot I think. My display style at the moment is really simple, so why I need 9 clone pilots for example is silly. If it was more diorama based or like Rob's, then sure, it makes sense but I think any and all of the armies will end up well thinned. I'm also pretty comfortable with the idea that I can get buy with a reasonable progression of a character through the trilogy (ies) without having to have one of every release of a character, so Anakin will get cut back pretty substantially too.
Still working on the one wall and no intention of doing anything else in the room until I get that portion where I want. Here's the whole view:

I think on the wall that is at the back of the room, I'll put up some more shelves in line with these to form a corner area and they'll end up about 6 feet long as well. I'll probably put the vintage boxed stuff I have there to keep the linearity of display going and keep SW all along that side.
As for the rest of the pics, just closer up views of what is out so far.
Vintage first...


So you can now see what the shelves look like on closer inspection with the risers in place. I think it does a very adequate job of raising the figures just enough that you can get a better look at them. They're not all buried in quite the same way as a single level display and I can actually access them pretty easily without knocking the rest down.
Top shelf is prequel stuff:
Episode I

Episode II

Episode III and clone overlap

I'd really like to get all the prequel stuff, the EU stuff I do have and the Clone wars stuff all onto that one shelf. As it stands, I've got at least 20 figures that don't fit up there and the EU/CW stuff isn't even remotely there and that's another 100 or so figures

So by my early calculation of 336 figures per shelf, I need to cull out about 100 figures to get the other stuff up there and have no room for expansion when other stuff comes out. So probably half of what is there needs to go. Ugh.
I started putting out the Kubs as well and I'm a little concerned about the room I have set aside for those too. They don't come out all that often but I plan on keeping up.

As I've been putting out more, I can't find my old Anakin chase Kubrick from series 7

Talk about depressing. I'm pretty sure it's around here somewhere, but not at the moment. Anyone got a spare?

So once I have the PT stuff culled, I'll get the risers on the middle shelf and see if I can't get the OT stuff up there. I'm pretty sure I won't get the vintage, Kubricks, Bustups and titaniums all on one shelf, so I expect that I'll end up with more shelving than I wanted dedicated to SW. After the SW stuff goes out (and the vinty stuff will be a huge pain to deal with, I have no idea how to go about displaying the carded stuff) I'll start working on the busts on the other side of the room and then onto the Marvel, DC, Simpsons, Movie Maniacs, Sportspicks, BTVS, etc. If I'm done by spring, I'll be amazed.