I have one compvr 12 in the back of my contour and it works pretty well. I made my box out of 3/4" mdf and sealed it with white latex caulk and it seems to be airtight to me. If you want boomy base then i would go with ported but for me a 2 cube sealed box worked out well. It hits really low and has a rather tight sound to it. As for glueing I used standard wood glue and angle clamps then used 1 3/4" coarse drywall screws spaced about every 5 inches. Make sure you drill pilot holes or the wood can split. Also countersink them for a cleaner look. To finish it I used carpet from auto zone made for covering boxes.
Mike
