Hi Sung
I don’t have experience with Rhino or Meshmixer, but from other sw packages we know there’re some issues regarding PROPER scale import. 3Ds max is working, Maya is working and other sw, too… in Maya you need to set it from cm to M and it’s working properly…
When you use Workflow 1 and 3, then it’s WORKING, as we’ve tested it many times.
Look for import settings in the software you use, if you can eventually change units for imported files.
I’ve even seen that you need to set CM to get proper scale in METERS, which are our units…