[Suggestion] hostile creatures ect

Is custom creatures, ai, and structures geared toward base defense currently possible.

I was looking through steam forums and seen someone else more or less getting pissed and moaned at for suggesting it, but i’m also interested in the idea so i figured id post and see if anyone could point me in the right direction on if its possible currently with the game, orginal thread on steam

eh maybe not as nebulous and loosely defined as a overhaul mod for the game, but maybe a creatures with a time table on spawn that respond to the player and structures, eh that may be a pain since i assume structures dont have any decay or health values…

Either way, on a scale of 0-10 with zero being impossible, how much of a punch in the dick would this be to make?