Yeah this server is awesome! I'm glad I chose this one over the other one I was considering, I have to compliment Vir on a job well done.
I worked a little on the castle (it's freaking huge, going to take forever!) I have currently completed the smallest of the eight towers. I'm contemplating the possibility of making all the towers 5-10 blocks higher, which would effectively add another couple of interior floors. I was also thinking of making a big central tower, a keep of sorts. And a moat.