Its taken some time but we now have a path for importing any model from the 3D Warehouse into Crysis, the movie below details the Tate Modern:
We are not sure what the license implications are, but as soon as we know and as soon as the latest exporter is out from EA (soon) we will have a tutorial and work flow online.
Our progress to date movie is embedded below, featuring the Swiss Re, Tower Bridge and work in the Sandbox:
The potential of using the 3D warehouse in Crysis is intriguing to say the least...