Combining materials in a custom building system

Hello, I’m working on a game where a grid-based placement system is the main mechanic, and I’ve run into an issue with flooring and walls.

I’m already aware of how to make a grid based system, but my issue is that the materials on the floor and wall parts do not combine well with each other.

My first thought was to create a union of the parts when they were placed, but I realized that the player wouldn’t be able to individually select a tile if that happened. How could I go about making these textures combine while also keeping the ability to individually delete a tile/wall?

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You could use unions alongside “hitbox” parts that are just invisble and only meant for selection. I can’t really see a different solution, if you do find one, you should probably use it over doing unions in-game