I'm sorry, but the amp needing to be 30" deep was a typo, it needs to be 20" deep. I'm clearing out the corner now and will place each one in a relative position. The width should not be a problem for the amp, the tv will govern the width, and the amp will govern the depth?!?? I think. I got to have 20" deep from front side before...wait, 20" deep from the front then add the rest??!! but it's got to be enough for the tv to be 40" wide. Lol I'm going to place them in a relative position and measure. I'm wondering if the doors being that wide, will they start to sag or pull away from the hinges? I'm making it out of 3/4" MDF.