I was planning on building a box for my 12" Type R. After doing some research I decided on that box. But when marking it out the front panel where the sub mounts is only 12.5" tall and the sub is 12.5" total. The cutout for the sub is 10.9" Will there be a problem there. I don't have that much of a height restriction, I do but not at 14" total height. I didn't want to design it myself don't know if I'm capable, I would rather build off plans. Any advice for a noob is much appreciated.