I have managed to get the BI buildings to show up on the battlefield. I'm using a mod folder so things might be a little different if you are making changes directly to the main data folder.
(1) Copy descr_items.db and descr_items.txt from bi/data to [mod_name]/data
(2) Copy everything from bi/data/items/ to [mod_name]/data/items/
(3) Copy everything from bi/data/models_building/ to [mod_name]/data/models_building/
(4) Merge the BI and vanilla versions of descr_settlement_plan.txt
(4) requires some significant editing to: (1) remove any references to building types that don't exist in your export_descr_building.txt (like churches for example), (2) remove any references to the nomad and hun culture types from the BI version, (3) retain the Greek and Egyptian stuff from the vanilla version, and (4) add the new Barbarian stuff from the BI version.
You can get my version of descr_settlement_plan.txt here.
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