[quote=Cale Tucker]
I would prefer at least a Stone Wall around the entire island. Even if I am only building a few or so (hundred? I don't know) miles ever so often. I know it would take forever, but ..."They've been building walls there for 2,000 years!" (Quote from World War Z). I really want a wall there. And we can do "patches" but they will connect every time I start a new one.Cough-not saying it'll take me 2,000 years-coughTell me the price of a wooden wall and I'll just upgrade it in patches
[/quote]

As your faithful courtier, I must strongly advise against this idea.

The biggest, baddest medieval fortresses could cover an area of around 20 acres. Lets just use this as a base for what a Great Manor and Great Wall combination is.

The island, according to the measurements I have calculated, is 766 sq. miles ( my original estimate was based off an incorrect remembrance of high school geometry, hah ), which is 490,240 acres, meaning you would have to build 98 miles of wall to cover the island.

While this is not the greatest feat of engineering ever commenced [ the great wall of china is 5,500 miles long ], the expense for you would be ungodly. Since we're assuming the Great Wall in the manual is going around an area of 20 acres, this means you are essentially purchasing 24,512 Great Walls, meaning the cost to build a Great Wall around the whole island would be 3,064,000,000 bullis.

Even just building a wooden palisade around the island would cost 245,120,000 bullis. I don't even need to tell you how much money that is, but I will: in order to make that amount of money, at your current income level, it would take you almost 1600 years. 

So, yes, you would actually be building walls for 2,000 years.

I'm sorry to crush your dreams, Cale, but I'm afraid building a wall around that specific island is impossible for you. Find a nice, small island to build on.