How can I hide on top of this with tile pieces?
To make it like this:
//Edit Thank you for the solution @jncraton
Before answering I made it like this:
But now it looks way better and it will be more stable:
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If you are able to use up some additional space inside the build, you should be able to use 68013 Brick Round, Half 1 x 2 (one under each tile) to support the corners: