Measure the height and width of your amplifier. Since amplifiers are built to different shapes and sizes depending on the brand, you will need to make sure your measurements are accurate so that you can choose three wooden planks and have them cut to the specific height and width of your amp. Make sure when the boards are cut that all three of them are about 1 inch taller and wider than your amplifier on all sides; two of the planks will cradle your amplifier while the third will act as a kickstand, propping up the amp from behind and allowing it to tilt upward at about a 45-degree angle.
Take one of the boards and lay it flat on your work surface. Then, take the second board and stand it up straight so that the two pieces of wood form an L-shaped platform. Attach the two boards together by screwing one hinge onto the left corner and one onto the right where the two pieces of wood meet and form a 90-degree angle. This part of the stand is the cradle where your amplifier will sit. Now, drill a hole about four inches in diameter at the bottom of the back plank so that you can run the amplifier's cords through the hole and into your power strip or surge protector.
Attach the third board with the two remaining hinges, screwing them in about two inches below the top of the back plank. This will angle the third board toward the floor so that it props up your amplifier stand; the third board acts as a kickstand, pointing your amplifier up at about a 45-degree angle so that you can create the clearest tone possible from your perspective on the stage, or wherever you are set up to perform.
Slide your amplifier into the L-shaped cradle. Plug in your guitar and give your new custom-made amplifier stand a test run, making any necessary adjustments to the overall tone and warmth of your guitar based on the new sound trajectory.