I recommend against a wooden squat rack, for much the same reason that I recommend against a wooden car.
Mark RippetoeOnly people willing to work to the point of discomfort on a regular basis using effective means to produce that discomfort will actually look like they have been other-than-comf ortable most of the time. You can thank the muscle magazines for these persistent misconceptions, along with the natural tendency of all normal humans to seek reasons to avoid hard physical exertion.
Mark RippetoeFor young males that weigh between 150-200 lbs., deadlifts can move up 15-20 lbs. per workout, squats 10-15 lbs., with continued steady progress for 3-4 weeks before slowing down to half that rate. Bench presses, presses, and cleans can move up 5-10 lbs. per workout, with progress on these exercises slowing down to 2.5-5 lbs. per workout after only 2-3 weeks. Young women make progress on the squat and the deadlift at about the same rate, adjusted for bodyweight, but much slower on the press, the bench press, cleans, and assistance exercises.
Mark Rippetoe