I assembled mine inside the closet without a kicker or trim. The closet was too small to bring a finished piece in and set on a kicker. I needed to measure each spot I put a vertical piece. With a 1"x6", the internal diagonal on the 1" side was negligible (96"^2 + .75"^2 = 96.0029"^2), so I cut the pieces exactly to the height of the spot I was putting them. To exemplify what was stated by someone earlier, my floor-to-ceiling height varied from place to place ±.5". I used pocket holes and screws to secure them to the studs (I didn't add a back because the wife didn't want to lose /any/ space), and used fixed shelves to act as cross supports and strengthen the finished piece.
If you're building the bookshelf in a large enough room, as I'm assuming you are, I wouldn't use the same technique I did. I thought it could demonstrate an alternative method. I'm sure there are many members that could tell you why this isn't the way to do it., but there it is, lol.
Last edited by tsrep13; 09-27-2012 at 02:17 PM.