I've followed your tutorial to get builds working on my system again and I'm running into the exact same results you are getting. Have you tested any of these 64bit engines you are sharing on your own system? The file structures are not correct on the files I've downloaded from your repository of wineskin engines.
Along with the lib and share folders there are also files missing from the lib64 folder from our builds. Are we suppose to add files to make these work correctly?
DankoB wow builds and 64bit builds are not the same thing. Why would you need 32bit libs alongside with 64bit libs in order to make 64bit apps works? I never compiled wow builds, that's why I shared above
link from wineskin's forum that gives you the idea about the 64bit compatibility of wrapper itself.