By doing what you are asking, you not only would break a site rule of this website, but also a real life law (rule). By putting WoW models into WC3 maps you allow illegal free use of them by anyone with WC3, even people who do not own WoW like me. Thus you are distributing a copyrighted recource against it copyright, so blizzard could file a law suite, if it wanted, against you which could cost you personally many thousands of dollars. Thus do not do it.
This has been discused a lot around this site in the past, so if you want to know more, just search and read and do not turn this thread into a new discussion of WoW model legality.
PS. This rule has been in place for well over 4 months.