FINALLY found the trick to make decent outlines :-)
i had to zoom in much more on the map.
here are 4 more Belgian airports ;
EBUL, Ursel : a former reserve NATO airfield, now used by a airclub
EBSU, St.-Hubert AB, same story
EBSH, St.-Hubert grasfield, mainly used for gliders : did the contours, buildings and rwy, as there is nothing on the RB map apart from the name
EBBX, also a former military reserve field, now used for recreative aviation
Rod, i noticed the outlines for Bertrix are "out of line" with the rwy possition on the RB map ( EBSU also, but not that much ) is there a way to correct this ? please let me know.