I bought a wardrobe from ikea to store my work clothes in. While walking around at ikea, I came across a Pax wardrobe with a Komplement pants hanger on rails. Unfortunately, they did not make them in the size for the cheapo Kullen wardrobe I bought, and I sure as hell wasn't going to shell out 900+ for a Pax just so I could have the hanger. Plus, it was made out of wire for the most part, and flexed a lot and made a nice "twang" sound when you flicked it.
Step 1: Plan it out
I started off by measuring the space that I was to mount this in. it ended up being 31" x 19".
The sliders occupy roughly 1" of space, so my needed to be ~ 30" x 18" or so.
The frame needed to be able to hold its shape and not flex, and it needed something a bit more substantial than one single hole to hold the dowels. i decided on something like this: