I'm about to start building my box. I have a sketchup of it and I've already ripped the MDF into the appropriate sizes. But, I do not have a router and can't seem to find anyone who does. I only intend to make this one box. So, instead of spending $100 for a router, $30 for a jig and then more for the bits, I have contracted someone to do this part for me. Since I already have the driver, I have the specs for the flushmount cutout. But, I do not have my ports yet. I am getting the 4" precision ports from PE. I'd like for those to be flushmount also. I can only find that the cutout for these ports is 6.25" diameter. But, I am unable to find anything that gives the dimensions for making these flush. My best guess is that I would have to do something like a 1/4" depth as wide as the flare. But, without the ports in hand, I am stuck. Anyone have experience with these ports in this situation? I just may have to put my guy on hold until I ports are delivered to me if no one is able to assist. Thanks.