So after setting up Campsite on the main domain I discover that it has somehow "mislaid" all paths to a certain folder in the subdomain, which - by all rights - it should not do anything with.
I cannot get anything to install past 3.3.6 and that I can only install as an update of 3.3.1.
All later versions crash the VPS.
I need to get _one_ version working asap now, which is why I try to get the classic templetae to work on 3.3.6. After I achieved that I can give you ready access to a typical shared hosting access so that you can have a go yourself, if you want to test that.