Been there - done that
You need to know your wood source. It's nice to have a table saw, router, and drill press to do the job. You will need time, tool set up (building jigs and measuring your cutters), and clean up. You will get the satisfaction of saying "I built my own bed wood." But in the long run you won't save much money and they won't have the professional look. But that is OK if you plan to use your truck for work (i.e., no rubber mat in the back when you haul things).
