This is an Fotress made by Trees and Saplings it have got an little water hole and squids.
Added cannons and more animals ( because on Super Flat its a little rare to have company)
Texture not required but you can use one
No Mod required but you can use one
From Preference use 1.0 actualization of Minecraft but you can test as anyone

And another thing, sometimes the pigs invade the fortress!

Credits above the Stairs!