Today, 22:00
On some models in my dealings with all the conversions I've done. If the model doesn't have two separate, i.e. a separate exterior and interior model it wont show up in P3Dv4.5. It isn't always the case, but largely this has been my experience moving some FSX, but nearly all FS9 stuff is this way. So when you convert the exterior, if it doesn't have an interior, you have to either merge out the interior model from the base or sub/model merge another aircraft's interior model and subsequent panel to it.