Enhanced 4X version 1.45 has been released. In addition to bringing it up to date to the latest version of Rebellion, it also adds most of the changes to defensive structures detailed here. See the changelong here or in the readme for more information.
Full Disclosure: This release may not be entirely bug free, I only tested it in two games, one of which I encounter a reoccurring minidump but could not figure out its cause. If you run into any problems, please post in the bugs forum.