Describe your feature request
I was trying to build a window outline using the vertical slabs but found that you can not combine different slabs.

Describe the solution you'd like
It would be cool if support could be added to combine two different types of vertical slabs. I have provided images in the additional context section.

Additional context
Thank you for your time and for making such a cool mod!

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this is already being tracked in #8, thanks for the feature request tho!