I'm not a huge fan of the Plexmbc setup. It's an odd duck. Depending on your needs, you can possibly get the same thing or better by just using the Emby server and client. Emby is easier to setup and you get all of the same/similar centralized management, scraping, and transcoding functions. On the other hand, Kodi is MUCH more configurable, but that makes it more complicated. On Windows, you can use either the WMC Emby client (my preference), or the standalone Emby Theater client. Emby is catching up to Plex in the number of client options, including phones, smart TV's, etc.
If you're looking for the crazy assortment of addons, some of questionable legality, then Kodi is the way to go. If you want something easier and just as powerful (sans illegal streaming options), check out Emby. Of the major three players, Plex by itself is the simplest and most restrictive, then Emby, then Kodi. To me, mashing the Plex backend into Kodi just makes it into a wanna-be Emby. They each have their place.
Is your source material streamed from the web, or located on the server? Wireless streaming of local content never works well for me.