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use human bones for the rails, slides like butter, and if you cant find any of them, just put dish soap on cardboard and nail it to the rail, it will work out dont worry. oh yeah, video youself doing this so we can watch..
buy like some wooooooood then buy some lexannnnnnnnnn or some pvc sheeeeet then put screwwwwwwws in itttttttttt and mainly use the seeeeeeearch bar once it starts worrrrrrrking because i posted detailed instructions on how to build a good boxxxxxxx the threads called how to build a 12 ft boxxxxxxx chek it outtttttt