The radar rotation just isn't set; PCS does the job but you have to click in another field for the change to take effect. These models do in fact crash modelview, but PCS runs them fine if you turn off the render window. I'll take a look at the Bellerophon and see if I can spot the problem you describe; I haven't had much trouble with it thus far.
Multipart turrets DO NOT, I REPEAT, DO NOT NEED ROTATION. People have told me about this countless times, but the things still work fine. I can't set it on export, and it works without it, so I just don't set it.