Ship design questions

 Okay, I am building a few ships (3D 1-1 scale that can be used as a map) and I have a few questions.<div>  I know I am over thinking alot of things but I want to use as much real world Science and engineering as possible along with a healthy dose of Science fiction.<div>   I've been reading the past forums and find a lot of it Enlightening. And that some share my view on some things. So I want to pick your brains on things. <div><br /></div><div> How thick should a hull be. From the inner walls to the outer skin.<br /> </div><div> Right now I am playing with a 2' thick internal walls, but how thick should the barrier between life and death be? </div><div><br /></div><div>  I know that SFKH uses shields and screens, but how thick should any kinda albative armor be? </div><div><br /></div><div> </div><div><br /></div><div> Tech wise what sort of material do you think most ships are built of in the SF settings. Barring any kind of exotic/ima</div><div> </div><div> </div><div> </div><div><br /></div><div><br /></div></div></div>