Great looking tiles! I created a very similar wall some time ago, also using the shape generator (which I use a LOT).
But... the result is a wall with a huge object size, which for my big projects is a no-no.
Of course I consider myself a bit of an optimization magician
Create the shape as you did but make the back invisible before export. You don't see it anyway. That's just two triangle faces (or a single quad face) but with a thousand tiles it adds up.
For the box under the shape only use the top of it as the seam. That's another bunch of faces you can rid of.
A nice trick is to make the box top (seam) invisible with d 0.0. That way you can use the wall itself for the seam color. Much more efficient if the seam needs a texture instead of a color: only a single texture on the wall instead of on every tile.
You will be surprised how much that reduces the overall object size!
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