building icon

Hi, I'm looking to make a modded scenario which uses all the buildings from both the base game and all of the Conquest Scenario buildings (buildings from Mesoamerica, Mesopotamia, etc.). I know that someone did something similar for all the resources, and was wondering if anyone had already...

I have a city-centre building (a fireplace) & want to have an icon for that building displayed in the Tech Tree under TECH_POTTERY. The mod works OK I just need to hookup the icon/graphic. Unfortunately, the game logs indicate a FORIEGN KEY error while inserting rinto THE IconDefinitions file...