thats all fine and dandy ,until they search your house, seize all your firearms , keep them at the lab for 2 years , then send you to court for another year or two .It would be easier to build and they don't have to see it as I understand it. They wouldn't like it but I don't think it is against the law.
by then your family and friends think your a nut. then if your very lucky you get your stuff back beat to ####. missing mags , and parts.
then they say .thats how they seized them, and you have to suck it up, or take them to court again.
O , I forgot to mention how the $40,000 lawyer bill is going to screw you over worse than the police did.