Models often do not show in Blitz3D. Quite often it is due to scaling - ie the model is too big or too small and it needs to be scaled, which Blitz3D can do.
When loading a model into B3D, it's always handy to use PointEntity camera,entity - at least then you have an idea of where your model is. Try moving the camera on the Z plane - PositionEntity camera blah, blah, Z - to move the camera in and out of the scene - if the model is too big, you need to move the camera out of the scene.
If this doesn't work then you will need to mess around with ScaleEntity.
When loading a model into B3D, it's always handy to use PointEntity camera,entity - at least then you have an idea of where your model is. Try moving the camera on the Z plane - PositionEntity camera blah, blah, Z - to move the camera in and out of the scene - if the model is too big, you need to move the camera out of the scene.
If this doesn't work then you will need to mess around with ScaleEntity.