i want to build a sten gun. i have no papers other than my pink slip. 1st can i do it in semi auto with no papers? 2nd i can find kits but no main tubes for the body.(were can i get one ?)3rd do i have to stamp #s on it and turn somthing in when im done? im sure ill have more ?s but for now i think thats it. any help will be cool!! thanks