Gee I love it when people are barking up my tree
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Working with a specific measurement is not a problem, but please, do not mix two or more units of measure on the same plan sheet or drawing.
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Sorry Glenn...I do it all the time
Hopefully it's all covered by the very handy "UON" = unless otherwise noted!
Anyway, don't be too disheartened because you use an out dated system of units. The crux if the matter is you could use anything as long as you're consistent and as long as you cut, punch, draw out, upset, drill, etc etc etc to the length required.
Another interesting twist to all this. While setting out for sewerage work ie for trench digging and pipe laying and all that jazz we always had to appear to quote to the nearest millimetre. Ye gads! you say, the sewers are layed very acurately in Oz. Not really. If you quoted a length at say 5.9m it would be taken as 5m plus 9mm similarly, 5.91 would be 5m plus 91mm which amounts to a fair sized error. To overcome this we'd always say 5.900 or 5.910.