While I would much prefer being able to design my own castle, I must say, this new castle design is pretty nice. The classic castle wasted so much space, with long, narrow corridors, a large area "outside", and ladder requirements to get to certain areas.
As you can see, I fortified the entrance for Siege. I have public crystals for teleportation and vendors are being set up. Come visit the "Slave Market" in Trin swamp.