Ok i started playing with google sketch to design a box tonight. Does this look pretty good for under the back seat of my truck. The subs call for .75 cubes and take up .18 so I over shot it a hair at .97 per sub. All they have in town is 5/8 mdf will this be good. Its the reason my measurements are -1.25 for the sides instead of -1.5. Thanks for any input guys.