Hi Zarathustra,
Welcome to the forums.
The mod is very much still in (re-)development, but we have a semi-playable pre-alpha version, and we're making good progress.
To get the current version up and working:
1. Make sure you have Civ4 and Beyond the Sword expansion, patched up to version 3.19 (the latest patch).
2. Install the main mod file in the Beyond the Sword/Mods folder.
3. Install patch a (Quick Fix 1), from here:
http://forums.civfanatics.com/showpost.php?p=8920645&postcount=136
Extracting the patch into the appropriate Overfolder and then say yes to any merge/over-write questiosn you get.
4. Install the music pack. Again, merge/overwrite everything.
5. Delete the 'Art' Folder in your "Beyond the Sword\Mods\Warhammer Heart of Chaos 0.04\Assets" Folder
Delete the 'FFPak051' File in your "Beyond the Sword\Mods\Warhammer Heart of Chaos 0.04\Assets" Folder
Delete the 'WHoCPak004' File in your "Beyond the Sword\Mods\Warhammer Heart of Chaos 0.04\Assets" Folder
6. Install patch b, merge/overwrite everything when prompted.
We should have a new version out soon that fixes a lot more bugs, and will be much simpler to install. Patch b was complex because it needed to delete some files, which you can't really do with a simple patch.
So if you can't get the current build working, you might want to just wait a few days until the next version is up.
Also, check out the design thread that has the main unit design if you'd like to see what we have planned.
http://forums.civfanatics.com/showthread.php?t=334546
We also have a lot of content from the "old" 3.17 version of the mod (magic, events) that we will be merging in.