Okay need some ideas. I do not have a spare, so a lot of room to play with. I want to run a single 10, 12 or shallow mount 13 in the trunk. The max mounting depth is 6.5". I calculated around 1.5 - 1.75 cu air max to play with. I have considered 1) making a mold using the foam insert, 2) making a good ole fashion rectangular box or 3) masking off the whole area and glassing from scratch. What do you think?