[RunTMCfan]

Let me start by saying I have 15 years of advanced car audio experience. I've built numerous systems for all types of budgets. I was going to open a shop fresh out of highschool and found out how little money is in car audio sales/installation. So now it's a hobby of mine.

The above referenced link is pretty decent. I've seen it a few times. I'm not too hot on upholstering fiberglass sub enclosures. With all the time and prep put into a nice fiberglass finish, you can paint it very nicely without the seems of vinyl. A custom molded fiberglass enclosure looks too "futuristic" to put carpet on as well. If you build a box out of MDF I would upholster it.

I highly recommend that if you are doing your own sub enclosure that you stick with a sealed enclosure versus a ported box. A ported box will give you more output but proper tuning can be a bear. They can sometimes sound sloppy with some heavy drums. Sealed will make you happy and play all types of music without missing a beat, literaly.