There was another project that ported Hexen II to the Mac Platform. However, the project seems to be dead, but it did make High-resolution images of the Hexen app and it's documents. Attached is the file for the main application.
Madd the Sane
High-res Mac OS X icon
Fowarding this to Levent, our Mac guy. Thanks.
v1.5.6 release includes a new icon for Mac OS X. Closing this.