I have to say with the materials and lighting set up in this scene, have you considered moving it over to Unreal Engine 4? This would look AMAZING with PBR materials...
Hey Warren, I've definitely considered moving to UE4, it's been itching me since the release. I've been gathering information about UE4 and PBR and getting more comfortable with the idea of moving over. Also it's early enough in production so it still could happen!