Here is a simple guide to building a simple round(ish) platform for a Map-Room. I figured I’ll be building a lot of these on my private server, so I made this.
I meant STAIRS not RAMPS. My bad.
Ceiling tiles won’t work because of stability. Look at this CEWiki page : How to close a Map Room
What Yensu propose is a lot more huge. Enough to make stability a big problem if you want to use ceiling tiles rather than foundations. So to avoid it you’ll need to put foundations at the center, the purple ring on Yensu’s drawing and the outer ring. I think it could work with ceiling tiles like this, but having not tried it I can be sure.