I just made up the object. I did have the wall thickness wider, by about that 50% value. The problem was that the log ends had the circular cuts elongated horizontally, appearing distinctly oval, due to retaining the same number of logs for the same height. And so I did make the wall the usual thinness. To be satisfied with the appearance of a thicker wall than this, I might have to make up a new texture.
I recall that you've cooked up some texture of your own (which would be nice to offer to the rest of us

), but I want to have an appearance that's consistent within the set of objects sharing the same texture, for everyone else.
Note that the walls are 23cm, or 9" thick. How does that compare to some real examples? It seems reasonably decent for a 'thin' shield against bomb splinters and bullets, representing a more quickly thrown up shelter, or one where available wood is not plentiful. Moreover, isn't it slicing things a bit on the fine side to have a second object whose walls are a not terribly different thickness of about 2/3, where a factor of two is a more meaningful difference?