With the storage box, the first thing you have to do is remove the back cover. We need to install the motor and pulley assembly. Be very careful not to break the board or frame. Save the back panel and you will need it later ( See pix 1, 2 and 3). Remove the balsa Rod, cut it into an internal measurement on the upper and lower sides of the shell, and glue them 3/16 \"from the front edge of the shell ( See pix 4, 5, 6, and 7). These pieces will prevent the picture from falling back into the shell. Take about 1/4 out of the side block of fame. This will give the door cover enough clearance to slide on/off. Now grab the 1/4 \"x2\" Poplar hobby board and cut it into an external photo frame ( See pix 8, 9, 10 and 11). Make sure the outer box inside the shell is 1/4 short \", which will keep the picture in place and a channel will be formed with the previously glued balsa stick, allowing the picture to slide on/off ( See pix 12, 13, and 14). Stick the top, bottom and left side of the external photo frame to the front of the shell. Now cut the plastic plate to fit the inside of the shell, make sure you cut it into a size of about 1/8 \"short vertically, 1 long horizontally \". Slide it into the shell. Grab the right piece of the frame, stick it to the plastic board and test it to make sure it\'s free to go in and out ( See pix 15, 16 and 17). Install the maximum pulley centered on the right side of the sliding door. ( From the back). Then place two small screws opposite the Big pulley ( On the wooden frame) About 3 \"place the second screw 4 1/2 from the top\" below the first screw \". Please pay attention to the position of the tension wheel and servo motor, no matter where you decide to put them, they must be in the position shown in the picture and have enough tension to work. The string must have an \"S\" shape around the motor and tension so that the motor can pull the string, otherwise the motor will just rotate instead of opening/closing the door. Once the tension is in place, tie one end of the rope to the upper screw and wrap it around the tension pulley, wrap it around the large pulley and tie the other end to the bottom( Leave a gap for the motor). Now the tricky part, wrap the rope around the motor pulley and apply tension to the rope by pulling the motor from the tension wheel, once you have good tension on the rope (do not let go) Screw the motor to the appropriate position and do not loosen the tension on the rope. ( See pix 1, 2, 3, 4 and 5) Now is the time to install the led, contact switch and assemble the servo motor controller circuit. This has to be done so you can test the pulley system and make sure the door is free to open/close. Install LED lights and contact switches. The contact switch should be placed in the upper right corner of the housing and glue a small piece of plastic board to the plastic board so that when the door slides, it is in contact with the switch ( See pix 1, 2, 3, 4 and 5). Now take a look at picture 6 and it shows how to connect the lights and switches. You will extend to switches, lights, and servo motors, extending the wires across the wall to the circuit board. Take a look at the video below, which shows the motor and pulley system working from inside the housing. The last step is to run the servo motor line, the LEDS line and the contact switch through the top of the shell and in peace. It\'s time to hang the wall frame. Check the bolt position before cutting the wall. They are usually 16 \"center to center, separated from each other, and your Shell should be placed between the bolts. Trace the back of the housing on the wall and cut the opening 1/8 \"larger than the housing \". Before installing the housing, first pass the wire through the wall and then install the housing. Drill holes in the center at the top of the frame, which will be used to secure the housing in place ( Like hanging a picture on the wall). Note: When installing the case on the wall, I noticed that I was unable to put the case flat on the wall. The door does not slide open and it takes about 3/16 clearance from the wall to the frame. Fix this glue at a 1/4 \"x 1/2\" piece of hobby wood to keep the gap 1/4. This was done successfully and the door slid open without any problems. ( See pix 1, 2, 3 and 4). It took me about 31/2 hours for this project. From start to finish. I want to build something simple and useful at the same time. I don\'t have time to participate in the secret compartment contest, I don\'t know what to make, I want something unique, different from the other items in this contest. Finally, I came up with this project and it was interesting to build.