I have searched through the threads but haven't seen this particular subject. I'm looking at fabricating a complete composite subwoofer enclosure within the spare tire well of a 98 Saab. There will be a dividing wall in the center creating two seperate chambers. Considering that aspect I believe that I'm going to make 2 different foam plugs and wrap them individually with resin infusion. Then I will cut out the holes for the subs and extract all of the plug material. Then glue them together with polyurethane adhesive to install them into the well. I would like to use a combination of carbon(exterior), glass fiber(center filler), and aramid(interior shell). This will be my first use of this resin infusion. 1: What thickness would you recommend making the walls and what layers of the above materials would be best? I would rather it be too thick than be subject to cracking considering the amount of pressure and vibration from the subwoofers. 2: Can you see any problem areas with this process?