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theres a TON of info about box building and fibreglass on the web. for lots of general info, go to www.sounddomain.com and look through some of the installs there. many people take pics of thier projects in progress and give hints on what to do. take a looks at the forum there too, as well as www.termpro.com .
for the flexable wood you were looking for, yes, the do make that, you can get it here, although i doubt it would hold up to any pressure from a sub:
http://www.selectproducts.com/frameindex.htm
heres a write up for making a fiberglass box in the spare tire well, with good graphics to illustrate the point:
http://www.geocities.com/MotorCity/7165/how_to_1.htm
misc. stuff:
http://www.mtxaudio.com/caraudio/education/enclosureConstruction.cfm
http://forum.sounddomain.com/ubb/Forum11/HTML/027624.html
http://forum.sounddomain.com/ubb/Forum11/HTML/024465.html
http://forum.sounddomain.com/ubb/Forum11/HTML/028320.html
http://forum.sounddomain.com/ubb/Forum11/HTML/033596.html
that should get you started. as far as fiberglass goes, heres the basics:
fiberglass is sold as in either a cloth form or as chopped up "mat" form, where the pieces arent woven together, just kind of mashed in every direction. cloth is much easier to work with to lay down the first layer, but mat will be stronger and is easier to eliminate air pockets in, so its ideal for building up thickness. the fiberglass material needs to be wetted down with a mixture of resin and catalyst. depending on the weather, after 20mins-1hr the fiberglass dries completly, leaving a lightweight but very strong piece. so lets say i wanted to make a sub enclosure similar the the on JL sells that fits perfectly in the side wall area of the trunk, heres what i would do:
1) take out the back plastic panel from the car, and cover it thoroughly with masking tape (to prevent the fiberglass from sticking).
2) cut the fiberglass cloth into small strips, about 2" wide by 4-6" long.
3) wet the surface of the panel slightly with resin/catalyst mixture (this helps the cloth stick to the panel better and prevent a mess). lay the strips of cloth over the surface, and apply more resin/catalyst to the top of each strip with a small paintbrush, making sure to eliminate any bubbles by smoothing each piece out as i lay it down. criss-cross the pieces rather than laying them all in one direction.
4) continue step 3 using more cloth or mat until the piece has enough rigitity to keep it from warping when removed from the plastic panel. continue adding layers and shifting the panel around to make sure all the resin doesnt flow into the "valleys" of the piece, leaving some areas thicker than others. after about 6 layers you can stop. as soon as the previous layer tacks up and starts to become rigid, another layer can be added on top, you dont have to let it totally dry.
5) cut out a circle for the sub to sit in, similer to these:
6) attach the rign to the fiberglass back with dowel rods and hot glue.
7) wrap the whole thing in either sweatshirt material or grill cloth, or anyhting that is very stretchable on every axis, and contains at least 50% cotton. some synthetic materials dont "stick" to the resin, and can even melt! use spray adhisive to hold the material taught.
8) use a bruch to soak it with more resin/catalyst mixture. build up layers, and add some to the inside seams.
9) upholstur, run the wires, mount the sub, etc., and use screws with nuts/washers to moun the fiberglass piece to the factory plastic trim, and place it all back on the car.
one note: steps 6-8 are very difficult to explain without pictures, and i had no luck finding any, bu this is the same process used to make kick-panel mounted speakers, so go take a look at this and you can visualize it better.
http://208.186.209.135/main/toronto/pages/CAE/CAE.html
:shhh: i do cocaine :/shhh:
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