I just completed the bench for my layout. After I get a few supplies, I may have to add a wedge to extend the corners out just a little for turns, but I've managed to have room for 25" radius curves on the large squares with an additional 2.5" of space. Here's some shots to show what my blood, sweat, and tears have gone into the last few days.
Oh, and I wasn't able to have 30" shelves. There just wasn't room. They are 20" now.
http://i131.photobucket.com/albums/p291/moondok777/20081123_0036.jpg
http://i131.photobucket.com/albums/p291/moondok777/20081123_0037.jpg
http://i131.photobucket.com/albums/p291/moondok777/20081123_0038.jpg
http://i131.photobucket.com/albums/p291/moondok777/20081123_0040.jpg
Oh, and I wasn't able to have 30" shelves. There just wasn't room. They are 20" now.
http://i131.photobucket.com/albums/p291/moondok777/20081123_0036.jpg
http://i131.photobucket.com/albums/p291/moondok777/20081123_0037.jpg
http://i131.photobucket.com/albums/p291/moondok777/20081123_0038.jpg
http://i131.photobucket.com/albums/p291/moondok777/20081123_0040.jpg