Building underground

[Tayasaurus]

Some way for the bottom of the map to connect bricks to its underside so that my house can finally have a basement. In particular this idea includes a block that creates a "hole" in the floor.

[Ad Bot]

[Daffytitanic]

Like with Terrains? When they have holes? might be a good idea but, I don't really think it would be possible.

[xSetrox]

I don't think a hole in the fxplate can be done easily