I'm currently running a custom kernel with the file name:
I don't know where I got it from. Hmmm.
I could swear there was a link pointing to the download of the custom kernel mentioned in post #2.

Anyways. I initially had problems with enabling WIFI due to a naming mismatch between the kernel's uname and the original kernel's uname, resulting in differently named /lib/modules/[uname] directories.
(module could not be found)

In case of anybody else running into the same problem:
could resolve the issue by simply renaming (or cp -afr) the directory to the proper name, reported by `uname -r`.