I went about installing CC3+ core on Linux Mint 19 in a Windows 7 x64 bottle and things ran smoothly until I attempted to start the application. Something happened to two DLLs that prevented the application from starting. The DLLs Effects.dll and XPCC2.dll were throwing Error Loading XP Module errors and causing the application to close as soon as it opened. Crossover Linux caught the error and allowed me to download a stack trace but I was able to resolve the issue without having to dig into it. As I had the application installed in a Windows environment, I copied the DLLs from that installation and replaced the files in the bottle directory. It worked. However, I don't know if the full application is stable as I haven't done any extensive testing of it.
Also, when I updated the core installation, I had to replace the DLLs again. Also, when I installed the CoS add-on, I started getting a TravellerSectorImporter.dll error pop-up when I started the application but I could ignore that and the application still started. As my Windows installation didn't have this 3rd DLL, I wasn't able to replace it.