Because all it takes for an unpenetrateable base is a house and a box of nails... Also, I guess it'd be cool for some houses to have a porch. But that idea is probably unachievable... How does that sound, anyway? Edit: or tleast zombies destroying crates, they seem to be undestructible as of now, but player manages to climb through a window with crates on both sides anyway... maybe should have posted the latter in bugs section