The measurements on the plan sets are not in important the drawing patterns are the actual size if you have your printer set to no scale you not need measurements only the thickness is important so 1/8" = 3 mm 1/4" = 6 mm 3/8" = 9 or 10 mm 1/2" = 12 mm. and that is all you need to know and it not matter within 1 or 2 mm.on the the thickness.
The measurements on the plan sets are not in important the drawing patterns are the actual size if you have your printer set to no scale you not need measurements only the thickness is important so 1/8" = 3 mm 1/4" = 6 mm 3/8" = 9 or 10 mm 1/2" = 12 mm. and that is all you need to know and it not matter within 1 or 2 mm.on the the thickness.