okelidokeli, i am a little sad, because it seems so easy to me.
however, i followed my instructions like i didnt know nothing and here you go. this time i uploaded the test level. i took the bark.bmp(i know this is not the best detail-texture) out of the standard wad for the detailmap and the brickdark texture for the geometry.

download the files

i hope for ya buddies that you can get it to work .
and dont forget to try lower scales if you want to use it for a more multitexturestyle