Since I don't know how to get the custom skins working in the original moria, I'm left with this different updated version of the map.
I fixed the rcw from Cheeseh's wpt pack (same as in w00tguy's packs), so it should load (HEX edited the internal map name). But I don't know if it is a good match for the newer map version... Try it and see...
nm_moria_rcw.zip
[Edit] This rcw did not fit the map - link removed