Hi: Somewhat (I think?) complicated situation and need advice. I'm trying to hang one of those stud pullup bars-- the kind that you usually drill into your wall stud with lag bolts. Basically a left and right bracket affixed into the studs with 3 3/8" lag bolts each, 48" apart, and a bar between. You can easily google to see. I only have one wall where I can hang the brackets. When I went to drill holes for the lag bolts, it turns out my studs are only about an inch thick behind the drywall, then it hits the concrete outer wall of the basement. The 6 3/8" lag bolts that come with the kit have 2" of threading, and won't go in all the way. Some people online have suggested that I could lay horizontal plywood panels over the drywall, but under the brackets. The benefit of this is that it would enable me to affix the plywood to the stud inbetween the brackets, giving extra bolts. The brackets are about 20" high, so I bought 4 1"x6"x50" pieces of wood, which when stacked on the wall are 24" high (4 pieces, 6" each). The question is: on the center stud line, can I stack 2 lag bolts per 6" panel? That would mean I would be installing each bolt about 1.5" from the top and bottom of the panel. That would give approximately 2-3" inches (depending on actual height of the panel) between each 3/8" bolt. Is that too close? Alternatively, would the six 3/8" bolts for the brackets, plus one per panel (4) on the center stud offer enough strength? That would be ten 3/8" lag bolts total, each driven into the stud about an inch. I'm 240lbs and will do all sorts of swinging stuff off the bar, so it needs to be SECURE. Thanks all!