I know it might be too late, but let me share:
Fts are used in Range descriptions, while meters elsewhere (I.e. Falling damaged).
A COMBAT AREA is divided into zones. Indoors, a zone is typically one room. Outdoors, a zone is any patch of land up to 100 feet across.
Falling on a hard surface automatically inflicts damage equal to the height in meters divided by two, rounded down.
Nothing critical but consistency wise I would use eighter one or both.