Ridgelift visualization scenery object

The Mission SDK is pretty good at describing the RidgeLift object, and one of its attributes is AirObjectModelGuid which can refer to the GUID of a scenery object to include wherever the RidgeArea appears. Another attribute ScaleModel "Set to True to if the model should be scaled to match the size of the ridge lift box."[ref SDK]To avoid confusion here, I should mention there's also the AirObjectVisuals.xml file in the FSX root folder which holds default GUIDs for thermal and ridgelift visualization scenery objects - for thermals this is the spiral, for ridgelift the default is 'no object'.The lift within a RidgeLift box is a little complex in structure, and if you want to place RidgeLift, it really helps if you have a properly aligned object like this (trust me!):http://carrier.csi.cam.ac.uk/forsterlewis/...gebox_thumb.jpgI have a PROBLEM: scenery objects don't seem to scale to correctly fill the RidgeLift RectangleArea. In each case the height seems exactly right, the length is close but maybe 10% too small, and the width can be wrong by a factor of two, i.e. the scenery object massively spills outside the box. I've tried the 'green target loop' from the standard FSX scenery objects, and my purpose-built object, but both behave the same.Anyone else actually tried this? Anyone??