On the server I play on a player by the name of megaman2544 made a giant sphere inside there is a spleef arena where I (Paintboy100) host daily spleef tournaments (You are welcome to come registration is quick and easy). It's practically done, minor adjustments needed to be added to the spleef arena such as, hidden piston door, larger stands, and, a potion shop (Our server uses iConomy and ChestShop). Your welcome to come check it out.

Server IP: mc.omgwtfhax.info
Teamspeak Server IP: teamspeak.omgwtfhax.info
Website: www.omgwtfhax.info
Forums: www.omgwtfhax.info/forums
MSST (MegaSphere Spleef Tournament) official forum: turl.ca/MS_S
Server map to MegaSphere: (Join, walkthrough lapis portal, walkthrough green portal, follow map directions) http://i.imgur.com/RcP0L.jpg

Additional Notes

100% made by hand. No world edit, no building commands.