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If you were to port to the interior, as Troy mentioned, you have to slow the waves coming off the back of the speaker. Really, you don't want ANY waves coming in from the back of the speaker, but sometimes you have to make sacrifices. You could also do all the calculations for volume and actually port the kpanel boxes correctly for the woofer. There are a bunch of specs on the instructions that come with the speakers. Some of them are Qas, Vas, and other such non-sense. Those numbers can be used to calculate the required box volumes and port lengths and styles. Ideally, get in touch with the manufacturer and explain the situation, that you have limited space. When you've completed the kpanel box, provided the MDF wood you've used is resin coated, you can just fill up the box with water and then measure the volume in a measuring cup, Tupperware type juice jugs are great as they usually have a graduated measurement on the side. If needed you can then add the ports, whether into the luggage area, or inside the car. These little things are all pretty variable, so let us know what you decide to do. I bet the speaker manufacturer can help you out a bunch. Also, if you can find a really good stereo shop who doesn't mind lending advice, they are a good source of info too.
Regarding resin/matt ratio, you just want to use as little resin as you can to actually wet the matt, too much resin just makes it weaker and heavier. Put at least 6 layers of matt down, to make it at least 1/4" thick. I then like to spray the entire interior of the box with spray on sound deadening material, followed by polyester filler, the same stuff cheap pillows are stuffed with. You can find it at any craft store or fabric store. Try out the sound at every step, because sometimes it sounds better with less than more. Consider covering sound reflective surfaces with material as well, as the reflective waves play havoc especially in the 4K hertz frequency and higher.
Jason
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