RE: Where to get info on 3-D course plans
my suggestion is to help out at a local range, and gain experience. i know of no books, or articles that deal with layout.
look at every target in a 360 degree radius. remember that every miss has to go somewhere, so give yourself plenty of room for misses and glance offs. keep your lanes clear and unobstructed. make the range challenging, and keep the shooters attention. no-one likes a boring range. a good rule of thumb is if you are shooting a movable sight, keep it moving. change yardages at every stake. keep the people fed, and keep plenty of drinks on hand. a good thing for a local club is to set 3 10 target ranges, it helps with concessions and keeps people fed and hydrated. hope this helps.