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[quote user="GoatCheez"]Steel seems to be the de-facto standard now when building bases. Concrete AND steel actually... Make sure you have multiple thick layers of it on the outside shell so that it can withstand heavy fire. I can't count the times when a critical database of mine was destroyed from a stupid AK round. Never again shall I trust aluminum. Sure, it's light and looks all shiny, but it's weaker than shit. The most critical part is the armor for sure, so don't skimp. I've never had a layered stainless steel/concrete database fall under enemy fire. [/quote]Fluid layers help too. If get hit by high explosive clusters, you want some fluid layers to absorb some of the shock. Concrete distintegrates and steel gets mangled and bent, but if you put some kind of fluid layer in there, you'll withstand more of the heavy stuff. I'd suggest a sandwich composed of (from the outside in) steel, air, steel contrete, steel, air, steel, concrete, etc. I suggest air because it's still relatively cheap, but if you have the budget, latex is a lot of fun.