I have downloaded your alpha and took a look at it's models and textures.
The Buildings are very well done.
Their textures are elaborate, I felt some sort of favorable WABI SABI impressions from them. The Keep is majestic and the generator fits well with steampunk theme. and I am impressed at they have very nice construction models for each. Unit's and command icons are very good too. to sum up, I'm looking forward to further development of this mod. 
btw I suggest you add "difference engine" building or upgrade in your faction. It will fit well with steampunk theme.
What kind of benefit will the upgrade or building have is up to you (I think increase unit creation speed or harvesting speed might fit with difference engine).