You dont have to cover the entire surface, unless you want that nobody can spawn in.
Only what you dont want to decay (brickwall i presume). So if the entire wall is statued ... it's ok.
If you dont statue it, personnal claims are a good / cheap solution to claim huge wall parts (and inside too).
And dont forget to close mineholes and caves from the inside
(btw these huge bw are more for fun or work-challenge than security... patrol around quickly becomes a pain).
Too bad with this lag population dropped under 100... one of the idea of our own big wall was to make a safer place for noobs to settle and trade, discover the game. People "under protection" of a village, but not living in core city. We thought this way it could be easier to "recruit" noobs. With more people / noobs, we could have such interesting big cities developing, with a core cities and "suburbs", roads etc ... so these wall could be more useful and some game mechanisms of villages more interesting.
i think such cities existed in w3 like constantinople? (which is the city in real world i took some of these ideas of...)