Yes, but it only took one person two days to make that in Creative. Should deffo try this on the server though.
Fences work nicely, easy to place and easy to remove. Netherrack might be fastest to deflood the rooms, it breaks very quickly with even a stone pick, is plentiful at Nether Alpha and is almost entirely useless otherwise. We've had to melt most of what we get just to keep the stocks from overflowing.
I prefer sugarcane for breathing spaces, since it breaks instantly and you can walk through it.
