Errr... I have had a look at your undef.def. If I understand everything correctly, you are also excluding the stuff you have added in your NW HRP! *LOL* You must admit that's not very sensible.
I have added a modified undef.def which undefines everything EXCEPT the stuff thatīs currently in NW HRP (remove .txt extension before adding it). I advise you to always check this file as new contents get released and edit it accordingly.
Besides that, it appears my new def also fixes a problem with the NW replacements for the Commander/Pig Tank models (Floating Snowman and Snowman Tank) which were still shown as Commander/Pig Tank models ingame. This resulted in buggy enemy attack patterns etc.
As soon as you have added the attached undef.def, I suggest a v1.0a release is definitely in order.
Otherwise, I am willing to do the NW maphacks (after I have finished my 1st review of DukeDC maphacks).