Lately I've been considering the somewhat daunting endeavor of building my own cab. A friend of mine says he built a 300w cab, paying only about $80 for materials (although i don't know what type of speakers he used). He emailed me the schematics but I'm a bit hesitant to embark on this undertaking. Has anyone here built a cab? Any advice on rattle proofing the cavity, speaker selection, or anything else? Thanks.