I have enjoyed EZNEC for years and have modeled many new designs with it; I use it regularly. Some have become QST articles. Others were informative studies of basic antenna concepts.
I freely offer here my EZNEC model files, hoping that you may wish to share some of yours. I may post some here. Most of mine require a purchased version of EZNEC; I use EZNEC+ V5.0. It permits 1500 wire segments and has several featues not found in the free demo version.