I would like to share with you the files which you need to creat your own walls, outposts and buildings for your unique nation.
And you can try out my nordic nation (walls with pinewoods around, 16 new building, and winter terrain). Unfortunatelly for a while a can't work on it, i have got other things to do. Amarian techtre and kingdom alignment.
In the zip you find two folder and the faction file.
If you don't want to make your own style only use my nordic faction: add the tiles to your tiles (mygame/elemental/tiles), the faction to your races (mygames/elemental/race), and the mods to your programfiles/stardockgames/elemental/mods. You can have this view:

link: http://depositfiles.com/en/files/3qesk2cpo
If you want change something here comes some description:
The two most important world in these files are: "sgn" (sinusgammanordic) and "nordic". sgn (or most case sgn_) signs in the inputs that was necessary to change. Nordic is the baserace. Most cases you have to change these two worlds to have your own style.
So, first the faction file: if you want your own you have to define the follows:
<DefaultCityWallSet>sgn_CityWalls_Fence</DefaultCityWallSet> it gives you the wall types, if you want your own, you have to create the tiles
<NewCityHubType>sgn_Outpost</NewCityHubType>
<CapitalCityHubType>sgn_Outpost</CapitalCityHubType> zhese determine the look of your outpost and the center of your more advanced city
<RaceClassification>Nordic</RaceClassification>
<RaceDisplayName>Nordic</RaceDisplayName>
<RaceInternalName>Race_Type_Ironeers</RaceInternalName> its was a bit confusing, there are kingdoms/empires, men/fallen, and the factions men (again) ironeers, kraxis . . . So here we need the raceclassification row (and we get men/fallen/nordic)
<EnvironmentTerrainType>4</EnvironmentTerrainType> if 4, you have winter terrain
Ok, the tiles: there are tiles for the outposts, walls, buildings (and my files doesn't affect the special improvements, tiles outside the city . . ., but if you understand this files, you can change them either)
sgn_corecitywalls - it is my citywall, you can make here your citywalls, change the sgn_-s, make the tiles and change the <StrVal>sgn_CityWalls_Hedge</StrVal> at the hedgefortdescription (and similar changes needed on other levels)
The first file is needed to prevent you to build the kingdomspec improvments, if you have your own. Without this you could build two type of workshop, arcanelab . . . anything. In this file we prevent us to do this. Our nation is nordic, the others are men. If you have an improvement in sgn_nordicspecialimrovements and here, then you would be able built both. But:
<Prereq><Type>Allegiance</Type><Attribute>Kingdom</Attribute></Prereq> after this row we add this
<Prereq><Type>Race</Type><Attribute>Men</Attribute></Prereq> and we arent able to build it, instead we build the buildings in the sgn_nordic. . . .xml
But these files are unfinished. Not every building have that prereq in its description. These cases i use the same improvements for mens and nords.
sgn_nordicspecialimprovements.xml contains my building, to prevent the mens to use it
<Prereq><Type>Allegiance</Type><Attribute>Kingdom</Attribute></Prereq> after this row we add this
<Prereq><Type>Race</Type><Attribute>Nordic</Attribute></Prereq> and men arent able to build it
with this method we avoid duplicated buildings
My file are entirely free for use. You can use it for your mod, you can complete it, you can do anything.
If you have questions i will try to answer them. If you have the university please post a picture, i didn't see it in action.
I hope this post was useful and you will like my buildings.
These are the tiles i use in the mod. Some is the same as the original, but there is sgn_ instead of K_ at the begining. The name of the file doesn't matter. It helps you to differentiate. The internalname is the importan thing e.g. <TileDesign InternalName="sgn_fence_inside_01">. You can add any name to any file, thegame will read it.
MOD files:
sgn_coreunits, sgn_coreArmor, sgn_corevehicles: to have armors, weapons, traders
To gain the same effects as the >men< i add the >nordic< after
<Prereq> <Type>Race</Type> <Attribute>Men</Attribute> </Prereq> the original row
<Prereq> <Type>Race</Type> <Attribute>Nordic</Attribute> </Prereq>
sgn_cityhubs - it makes your city level up, its a base file, with minor changes in the file you can create a lots of hubtypes and you can add these files to the mods