An updated and expanded version of my Sky Base which you can find here.

This build looks best over water with the lowest two layers submerged while the pillar that runs up the center is designed for beacons. When I built this in my world I put the beacons (5 of them) at bedrock level.

Design includes a piston elevator designed by Mumbo Jumbo

Feel free to use on servers or upload edited versions, but credit would be nice. Let me know if you make any changes as I would love to see what others do with this build.