I built a set for my 06 T4R. I didn't really do a write-up, but there are some pics here:
http://www.flickr.com/photos/20210220@N05/sets/72157603094184084/
Now we need one of the rear seats though, so the full-width drawer is currently holding tools in the garage and I built a half-width drawer to replace it.
For the cost of doing it right with nice slides, latches, high-grade plywood, and a nice finish (e.g. marine varnish, bedliner, or carpet), I'd strongly consider looking at AT's composite drawers. I am very particular about having things exactly the way I want and not wasting any space, and I am also a cheap b*****d and my time is cheap, so I did it myself.
Where are you located? I could probably be talked out of my large drawer for the cost of the materials. Unfortunately, after 2 years out of the vehicle I finally tossed the side pieces on the left and right of the face of the drawer... not really needed in the garage.