Box building, funky question

I want to save trunk space and put my sub behind the tail-light in the corner of my trunk. I can create a box to fit in there, but it will have a funky shape due to the area of the trunk. Since I will be using wood, there will be squared corners internally, and I wanted to know if that was a problem? I know scosche and maybe JL are working on custom boxes for my car (2005 mustang), but I haven't seen their actual designs. I know I can build the box of wood and carpet for a lot less than $140.

So, will the funky shape work alright with my 10" Alphasonik 410 sub? I can do the math to get the internal volume correct, but I don't know about the other issues inherint to box design (ie, funky shape issues). Any help is appreciated.

Here is the best picture I could find of the corner of the trunk. My box should be smaller since it will be sealed, and more tucked into the corner right behind the box pictured. So there will basically be an indent into that crevase to increase interior volume. Will this be OK for a sealed unit?

http://forums.bradbarnett.net/index.php?act=Attach&type=post&id=14963

Why don't you fiberglass the back and use mdf where there is flat sections??

He has a good point, fiberglass will give you a much cleaner box with less wasted space, and I don't know if there really is that much of a sound/resonance differance but I like the sound of FG, and it's lighter than MDF.