Using ArchitectureCraft 3.98 on MC 1.12.2

I have run into a roadblock with my build because I can't get something to look right. I am using the roof tile block and rotating it sideways for 4 of the sides of a hexagonal room. The problem I'm having is that the straight walls use blocks that have horizontally angled textures. So, when I put the roof tiles sideways for the diagonal walls, the texture is rotated 90 degrees and now is vertically angled and doesn't match the rest of the build.

From what I could find there is no good workaround for this, so I have decided to make a request for a way to rotate the textures on blocks. If there's a way to do what I'm wanting to do, then please let me know. Thanks :)

Here is an image of what I'm talking about: