I have rear Jeff cooper article tactical architecture and am inspired to do my part to secure the safety and welfare of the occupants of the home. I live in a two story brick square house with ground level basement windows. I want to design and fabricate steel frame and mesh doors for the interior as well exterior doors of a home. I want the following resistance by the doors but understand the limitations a constructed structure offers - protection from basic tools( I can't protect against a cutting torch 9r grinder) -protection against simple kick in [slur against law enforcement in violation of forum rules deleted by staff] - all must be workable from inside a residence, not building a prison. I can do the work my self with a welder, the design is where I am lacking because I never have tried to secure/fortify anything. What thickness steel should I use 3/16 or 1/4? Would a square house style door be a better choice to replace exterior door In place of adding a "hard door" in between the screen door and exterior door? What are your thoughts on this matter?