So, I finally stepped down into that cesspool of an installation package. As of today it can be played with a devbuild. There was still a bug with parsing the RFS files that needed to be fixed.
Unfortunately, to get this working you have to work around the mod's launcher, and repackage it first:
- Extract just the NHIS folder to some place on your hard drive.
- rename the nhis*.art files to tiles*.art (*)
- rename nhis.ini to blood.ini. (*)
- zip this directory up but as the root folder in the zip, not as a subfolder like in the original.
- launch with -file nhis.zip.
- enjoy (or not - you will see once you start it why I made that remark

)
(*) The renaming is mainly for making it easier to launch, you could get around it with some command line actions, but this way is easier.