Build the main mixing desk with a solid wood such as oak or alder. The top of the desk should be 20 percent larger than your mixing board. This way, you can set your mixing board on the top and still have room for other pieces of equipment and possible expansion if you decide on a larger mixing board. Make the base of the desk sturdy enough to accommodate the weight of the equipment or attach the larger desk top to a simple sturdy premade desk.
Attach two extensions to the main mixing board to accommodate speakers at ear level in a stereo configuration. Measure the footprint of the speaker and cut a base for each side to that size. You can use plywood to make the arms for the speaker platforms from the same material as your desk and paint or stain to match.
Build an enclosure for studio effects. These devices are rack-mountable, so you must construct a box that will accommodate 19.5-inch rack units. You can attach rack rails to either side—make sure that the holes line up properly to allow all of your effects units to be straight. You can stain the box a complementary color to your studio decor and leave the back open to accommodate the wiring that will extend from the box to the other equipment.
Build a rack mount cabinet that can pull double duty as a table for musicians to sit at and listen to their sessions. Build three rack boxes as indicated in Step 3 and attach together. Cut a table top about 64 inches by 32 inches to attach to the top of the three connected boxes with one edge flush with the front of the now-single three-wide box. Set directly behind the mixing desk facing the front of the room so that you can easily access the effects in the structure by spinning your chair 180 degrees.
Build a matching large cabinet to hold microphones, media and any other miscellaneous equipment. Stain or paint this cabinet to match the rest of your furniture and attach a locking mechanism for security. Use glass for the doors or make them of the same wood as the rest of the cabinet.