Assuming this isn't on purpose and as perviously asked, could you please rotate the High External Wooden Wall so the Hard side is facing out. I modified your code as follows ...
if (Options.ArenaWalls.UseUFOWalls)
{
e.transform.Rotate(-66.6f, 0f, 0f);
} else {
e.transform.Rotate(0f, 180f, 0f);
}... and the image below shows the results (cross & support beams should be on the inside).
You could make this a single property for all external wall types, or individual properties for each. And with the new versions (or skins) for high external walls this might be an important update to get the jump on.
ThanX in Advance!