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It's also expensive as hell. In some cases if you buy a JL W& you need a custom box. At 3 different shops around here the most boring W7 boxes are still 300+ dolllars.
you make a design you want out of wood so say if you want one speaker tilted or someting you cut out a 1inch or so ring that you can mount your speker on and cut out wood stilts that you can hold the ring up on with the tilt and height you want then nail the ring on top the stilts and the stilts on a base board. then strech thin fabric over it and staple it down, next get some resin and fiberglass and go to town layering the fiber glass on the wood/fabric structure you just made. the when it dries sand it and paint it. not rocket science.
you make a design you want out of wood so say if you want one speaker tilted or someting you cut out a 1inch or so ring that you can mount your speker on and cut out wood stilts that you can hold the ring up on with the tilt and height you want then nail the ring on top the stilts and the stilts on a base board. then strech thin fabric over it and staple it down, next get some resin and fiberglass and go to town layering the fiber glass on the wood/fabric structure you just made. the when it dries sand it and paint it. not rocket science.
its not rocket science, but it is tedious and if you don't know what you're doing it'll come out looking (not to mention sounding) like shit.
it'd be best to have someone build one for you, so that they can actually make the enclosure with correct airspace so that it will look and sound how you want it to. unless you have prior experience with box building or fiberglass work, i wouldn't tackle it.
And working with fiberglass is very messy, and results are often dependent on having the right equipment (vacuum pumps are nice) and having experience dealing with the cloth and epoxy.