Issue with Nacht Der Untoten (and the majority of tribute maps) is that it's based on a third-party franchise.
I believe Ubisoft won't feature those kind of maps because of legal reasons. And that's a shame really, because I really love well-executed tribute maps!
Of course, MapSwapper now presents map makers with a tradeoff: either wait for Ubisoft to feature their maps (and gain more exposure), or rely on an experimental community-driven service to port the map (possibly into the Workshop category).
But at least now there's a choice, and players benefit. :)
http://d9ukzbi9ykxz6.cloudfront.net/.../thumbnaildata
TDM-DESOLATION ported to PC
http://d9ukzbi9ykxz6.cloudfront.net/.../thumbnaildata
DM-MECHSTORMER ported to PC
MECHSTORMER is overbudget, so unfortunately it probably can't be ported to PS4 directly. Seems to have published fine on PC with a budget workaround! :)
https://cdn.pbrd.co/images/HFqKWq7.jpg