I plan on making a flexy with 5 or so shelves. I currently have only a reciever, DVD player and X-Box but I want to allow for a CD changer and possibly a headphone amp in the future. My local retailer has 24" x 12" x 1/2" shelves. They are particle board I believe but have some sort of vinyl finish on them, giving them a reasonably good looking cherry wood type finish. They also claim to hold 200 pounds. They are only $8 each (Canadian at that). Would these make good shelves for a flexy rack? I also have 4 - 3/8" threaded rods in the garage. Would they be strong enough for a flexy like this? If not I can just buy new ones, it would just be nice to use these if I could. I also have some questions about ventilation. Since the rack is open to the sides and back, can I make the shelves fairly close together and still have good ventilation for the components, particularly the reciever.