The main issue is that I don't understand enough of how this is supposed to work in maven to get it to work properly. I would be happy to get help in this area.
Step one would be to make a release with just tar, zip, or jar-of-jar files to get the steps in place with version changes, tags, running tests during the build, and preparing for the next snapshot version and rebuilding that in Jenkins. After that, features like IzPack, JNLP et.c. could be added.
Could you please help me with getting this to work?