The map pack posted by "tHePLaYER" does contain
de_clan1_mill, which is similar to de_cpl_mill (I'm not sure what the actual difference in CS 1.6 is). However, I have a
de_cpl_mill that I downloaded a long time ago, made by "JuZak & Ekku ( #hashpipe )". It is not spectacularly made, but it at least follows almost the same layout and uses all custom tiles.
DE_CPL_MILL - Download
Hope this helps!