Never use nominal dimensions especially in a large project. You will end up with Creep...m
Back in the day when drawing by hand, all walls were nominal, never could measure 3-5/8" on my 1/8" architectural scale...
Never let AutoCAD tell you what a dimension should be, the designer needs to know
why a measurement, clearance, space, etc . is what it is. You can draw nominal and dimension accurately. If I decide to add tile/stone/extra layer gyp bd to a wall, I'm not going to go in and revise the cad for that extra layers' thickness. And I don't override the dimensions, I just move them off the cad lines as necessary to show the right measurement. If I do override a dimension it usually goes with 'VIF', though we do round (using precision display) to the nearest inch/half-inch frequently. Why ask someone to layout to 30'-0 5/8" when 30'-1" will do. (unless that 5/8" is
really important!) I always tell the story of one of my junior guys dimensioning a deck draing to 3/256" and the superintendant never let him forget it! Contractor's never understand "that's just AutoCAD", they think you really meant it.
Dan