ORIGINAL: Zor
Vasek,
Since 1/16" is larger than 1.5 mm and 1/8" is larger than 3 mm there is no need to go to the next larger Imperial stringer size.
Any notches in formers or wing ribs can just be touched up a bit if the notches happen to be metric and you can get only Imperial stringers.
Zor
Vasek DID NOT mention any stringer sizes as of yet, or IF he can get ONLY Imperial or ONLY metric wood...
How about you wait until the original poster answers until you (always) try to upstage someone else...