Darkflight12 asked me to post this for him, so here goes: On smp5 at Darkflight12s res, he has a "membership club" with a room, but he wants a working hopper door that can use a certain signed book to open. Darkflight12 will tell you the cost BEFORE you begin building, depending if he can supply the materials or not, so a full list of materials would be helpful. Talk to darkflight12 in-game to see if you want to do it If this isn't possible without command blocks, just post in the comments :s