GeddyLee 
Well it took 3 days total to finish. But I am really happy with results! It came out way better than I had imagined! I got the carpet from WalMart (thanks Jay! "Abrasive") and I got the piano hinge (32" section) from Home Depot (thanks again Jay! "Abrasive") and 3M 90 series spray on tackie glue for the carpet onto the subbox frame (thanks again to Jay! "Abrasive")
All in all I spent maybe $50-60 bucks total. Most coming from the 2 cans of the 3M spray ($25 bucks for two of them!!!) and the 1/4 MDF Board was about $10 bucks and the carpet from Walmart ran me $9 bucks and the piano hinge ran me $12 and I went ahead and got a hacksaw to cut the hinge to fit each side panel, another $19 bucks for a better one.
I cut the board to measure, then sanded all the rough edges and corners and then cut the carpet to fit, I didnt calculate good enough the length of the carpet so I had to ghetto fab the piece on the left side, but it came out well, not hardly noticeable unless pointed out. And then sprayed on the adhesive to the MDF board and laid the carpet. And then used my Irwin SurGrip tools and some scrap 1/4 board to use as a press to help the carpet adhere to the board.
I was a little nervous after adding the carpet if it would affect the overal size of the subbox area not allowing it to fit. But when I test fitted it after the glue dried it slipped over perfectly! I was quite stocked! The hinges were pretty easy and allow for me to fold them down inwards so it makes placing into the trunk a lot easier. And then you fold out the side panels. I will attach the amps to each side once I get my new Kenwood Bass Amp. The folder side panels act as a nice brace against frame not requiring me to add any additional anchoring.
Now for the final imagesAnd a big thanks Jay for his creative ideas on tools and stuff to help with this project!
Here is how it looks in the trunk.
And there is enough of an opening to allow the bass air generated to slip
through the top portion of the frame.
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