from a glance it seems ok... but...
... You did not include the actual art files (firehouse.nif files,.dds files,etc)
if you do not have those files included in your art folder... then that is why there is the 'pink' textures because the game has no files to reference
'pink' textures usually happens when files are referenced like here:
Code:
<BuildingArtInfo>
<Type>ART_DEF_BUILDING_FIRE_DEPARTMENT</Type>
<bAnimated>0</bAnimated>
<fScale>20.0</fScale>
<fInterfaceScale>0.5</fInterfaceScale>
[COLOR="Blue"]<NIF>Art/Structures/Buildings/firehouse/firehouse.nif</NIF>[/COLOR]
<KFM />
<Button>,Art/Interface/Buttons/Buildings/Palace.dds,Art/Interface/Buttons/Buildings_Atlas.dds,6,5</Button>
</BuildingArtInfo>
but no art files are in this directory:
path = Art(folder)/Structures(folder)/Buildings(folder)/firehouse(folder)/firehouse.nif file
but you need to make sure the path starts with either your mod or the custom assets folder...
if you do have those nif/dds/etc files please posted them too so I can try to figure them out... (note I am not a nif editor so if the problem is that ... I cant help you)
If you have no idea what Im talking about... please specify
basically these xml files point to the correct art folder and files (as far as I can tell... I cant test it without the correct art files) but you may not have art files in the correct folder or have them at all where civ4 game generates a 'pink' texture because of missing art files...
Im usually a xml editor/modder but I do know about simple dds textures and how to get existing unit/building animations to work in a mod... I also can make buttons using images and a dds converter
(basically Im a good xml proof reader

)
But I can not create animation models (like buildings and units) but I can edit existing textures for colors/shadows/etc
therefore if you have a model problem I wont be able to help
however if you have an xml issue or how to implement unit/model into your mod I can probably help...
I cant do python or sdk so AI issues are too advanced for my limited modding knowledge...
here are some references that may help you out (it did for me):
http://forums.civfanatics.com/showthread.php?t=148507
excellent tutorial on how to make civs and civ leaders
it also explains how to make unit/leader/flag buttons and static images for leaderheads
it explains basics on how to make an Unique Unit
It explained alot of the basics for me
http://forums.civfanatics.com/showthread.php?t=156760
http://forums.civfanatics.com/showthread.php?t=151450
these to go in depth about making buttons and other related issues...
they re a little more complex and confusing at times... but if you read most of the thread you have answers...
http://forums.civfanatics.com/showthread.php?t=141621
this one explains how to create a new technology... it is missing some stuff but you get the foundations...
http://forums.civfanatics.com/showthread.php?t=168876
this explains custom sounds for units/civs/buildings/wonders/etc
simple and if you follow the format its real simple
http://forums.civfanatics.com/showthread.php?t=153584
this is a little more advanced but it covers bonus resources and improvements
my favorite and most useful reference is this:
http://civ4wiki.com/wiki/index.php/Xml_files
although its not complete... it explains alot of the taglines for xml info
there was another website that explain more xml taglines but that site no longer works

It was a shame too since it covered alot of stuff that above link didnt
there are more tuts out there... but that's just to get you start
please not most of this is NOT for Warlords
however I think there were only a few different taglines added to the units and buildings xml files in warlords so most of the tuts should be helpful...
unfortunately no one has made an XML tut for warlords expansion (but I havent checked it a while so that may not be the case.... you hae to check

)
as for your mod sounds interesting and it will take some major modifications to make it work... but if you are enterprising you can keep most of it to XML editing... which is the easiest since it is mostly a 'database' for reference in the game
Note: I have used all of the tuts and created a mod that incoporates it but added some other stuff not directly mentioned in the tuts above... like modern missionaries/unique units for specific world/national wonders etc...
see learn more about it see my sig for links
unfortunately I have not upgraded ot to warlords but since not alot of peeps were interested with my mod... I dont have the motivation to continue the work (although I have a new update for the vanilla version ...)
anyway I used some fancy foot work and creativity with XML to create some interesting units/buildings... XML is the easiest to work with and will work better in Multiplayer...
I have added alot of custom buttons/images/ and building models (I got from this database with permission from creators) and changed the textures to suit my needs
I have added special city specialists... and images to match them... so although I cant create new images and models... I can sure edit and implement existing ones...
anyway I digress..
anyway I hope that helps
