Good luck with it PH. When you start building shelving, if you'll use good treated 2x4s ripped in half, not only for legs, but also for the rails, they'll go twice as far, and not be nearly as intrusive, but still be plenty strong enough for most any loads. I seldom use nails anymore either, even though it usually means pre drilling, I use screws.They hold lots better and are more easily removed when making future improvisations