As long as you didn’t republish the files you’d probably be just fine. Anti piracy measures rarely target the downloaders. Also as soon as we have that technology you’d probably be able to find those files for open use, currently there’s communities like FOSSCAD that are dedicated to open source software. I see no reason for that to change.

Two major issues here. One ammunition is an arm and protected by the 2A. You know that people can just cast bullets out of lead like people did for centuries before the popularization of the cartridge right?