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Great Thinking And Very Well Done!
you can always add a cheap pool noodle over the top for some quick padding thats cheap but make sure you measure roughly an inch and a half farther down
what about if you added a hole at the back to get to your cord easier and added some rubber on the edges to keep those costly amps safe. you could also add some straps on the back handle to small holes you cut below the amp in order to keep the amp in place, add some rubber to the bottom to keep it from sliding around and add velcro to the X parts so that you can tie your cord up when not in use and keep it as one piece for added mobility