With four plane sets a simple OAW setup would be to have the individual *.flt, planes.dat, pnames.str, etc, and appropriate skin and cockpit files in four OAW folders named "F-SAW1", "F-SAW2", "F-SAW3", and "F-SAW4".
The remaining common files go into "M-SAW" folder, although you may prefer to keep the terrain set separate in a "T-SAW" folder.

Jel
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My OAW and 7217stuff (JIM, JIMMSNFL) can be found at Sandbaggers:
Jelly's Stuff It's great to be of an age at which I do not have to suffer fools gladly