Works for me using Modify Furniture > Materials-Modify (third option). Adding a texture in the first dialogue (second option) will ignore the mapping altogether I think - and give stripes.
(t's only 1kb untextured, so it should be easy to handle)
Thanks, my kind of size. And nice brick texture. Too big, of course, but that is easily fixed 
. Did you, btw, notice that in SH3D 6 it is possible to do multiple select in the Model materials dialogue. Just remembered seeing your model and tried the new feature. Works like a charm, and super useful.
ok
