Ran into this earlier while upgrading some walls from sandstone to Yamatai. You can’t see the text indicating which side is the outside face and it’s pretty much impossible to tell from the little bit of highlight that you can see. The result is that the walls ended up with a randomized pattern of some of them being inside out even though the sandstone version was all framed the right way. It’s something that would be expensive and difficult to correct without destroying half my building to do it.
So I was thinking maybe we could do something like wooden boxes have where there’s a little arrow sticking out that shows which side is the front.