On the subject of not being able to select the model in game by just clicking on it. This only seems to happen with smaller models, I did find a work around for this, I don't understand what it does but it mostly works and enables the model to be selected after placing.
I had this problem with this Bicycle model, so in the scene hierarchy I re-named the main shape from
GN_1950_Bike to
GN_1950_LOD_3 . I don't know why I have to do this but it worked.
If anyone can explain what happens when you add the suffix
_LOD_3 It would be good to know.