I'm not sure about plans for a UDS but they're about as simple as it gets. There's plenty of builds in the UDS section with pictures and tons of videos on the internet. Here's a link to all of the parts that you'll need to build one http://bbqsmokersupply.com/uds-parts.html
You can use whatever you have available. I've used 4- 3/4'' intakes and I've used 2- 1 1/2'' intakes. You can always close off what you don't need and you won't need much once it's up to temp. I like to have intakes on different sides so that the wind doesn't blow directly into them.