It actually works pretty good. I did a small test interior of a car.
You will want this detailed and all visible mesh normals facing the player for the interior. The use of an _i.dds texture for illumination may be cool also.
You may need to play with the rotation upon export from your model program depending on which axis is y.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.