Hey mully, great looking shop u have there. If I may suggest a way to hang your lexan. Take two pieces of 1"x2" board the length of your lexan. Then cut a dadio about 1/2" a little more than the thickness of the lexan. mount the lower board to wall, attaching it to the studs, then set the lexan in the slot. Then mount the upper board the same way. All the weight from the lexan will be resting on the lower board, while the upper board will keep it against the wall, sorta like a picture frame. IF there is any shrinkage of the lexan, there should be plenty of room in the dadio cut to keep it hanging. Any if you are worried bout shrinkage, drilling holes would not be a good way to keep it from cracking round the holes. And this is just my thoughts of course.