Not necessarily.
1. If you want to, Look into MVSETUP, covered by the way in this month's CADENCE (just your luck!)
2. Otherwise, go into a created viewport in your "layout" sheet ("paperspace"

. ZOOM with a known factor relative to the paperspace sheet (which we take to be 1:1 for plotting...,) like:
"ZOOM;1/2XP" or like "ZOOM;1/48XP"
where 1/2xp gives a true zoom of 1/2 x relative to 1:1. That's 1/2 scale, isn't it! or 1/48, which is like 1/4"=1' (4x12=48: 4 is 1/4 inch, 12 is 1 foot: 4x12 is like 1/4"=1'! Try it. it always works- 1/2"=1':2x12=24S.F.!)
Ok, so if the 1/2xp zoom inside the ps viewport didn't get you to the size you want, keep "ZOOMing" standard factorsXP 'til you hit one you like. Eventually the trial-and-error will be replaced by knowledge/experience, but for now, this should work. Then-
3. Go to dimensioning scales and set your dimensioning scale factors (yes dimscale,etc, but there are better ways to get there...)to "factors relative to paperspace"-"yes". Check with your manual or another with experience for this. *** I don't do this. *** For my needs, I find that dimensioning using associative dimensioning (Hint- make sure ANY approach you use fosters the use of ASSOCIATIVE DIMENSIONING. This isn't even worth debating.) on the paperspace sheet with my scales set meets my needs perfectly.
All of this works no matter what's in the viewport (2D model geometry, 3D model geometry or 2D soldraw visible and hidden lines).
*Either way, P-Space viewports with Soldraw is really the only right answer! Good Luck and let us know how it went!
C.F.