I have figured this out. The solution made me feel like an amateur.
When editing the LocalGovernment.xml in Excel, Copy and Paste the values you would like for the additional fields (Type, AliasName, DomainName, DefaultValue, IsNullable, Precision, Scale, Required, DomainFixed) you are introducing into the model from existing values in the .xml. Something in the background did not allow me type my own values, you must choose from those already existing within the model.