Recently a friend and I came up with an idea to use some of my projects for a "city/castle war" PvP map. Not many of the other buildings had much that could be done yet, but the original Shimizu city had a lot of potential from the start. The changes include: the bottom corner spheres have been converted to cannon towers, most of the glass has been converted to obsidian to withstand blasts from other cities' cannons, the only glass that remains is in the cannon towers and the outer edges of each level. The bottom middle sphere now has a cannon in the bottom half and the spheres to either side have sniper platforms for players with bows and arrows. The top sphere has lava protected "loot" chests with some pre-added things in them (meant for players on a superflat world). A bridge between each cannon tower has been added with a smaller bridge connecting to the middle sphere on the third level. More updates will come out as the structure progresses and I get more ideas on what to add, so it will almost constantly remain at 95% finished.

Additional Notes

Feel free to use this as you please, just give proper credits