I was looking through the storehouse template competition and noticed that some of the builds had fences in the template. I have looked all over my design view and can’t see my fences anywhere in there. I also don’t see any way to place stone slabs. I can build dozens of them and they never show up in the place or build menu’s.
Do you mean these, perhaps?
These aren’t meant to be placeable, they are used as ingredients for certain type of roads (I think).
If you mean this other:
it should be placeable, just like the wooden fences (if you can’t, there might be a bug).
I don’t think that you can include wooden fences in a template (correct me someone if I’m wrong). They might have placed them after building the templates. 
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