You shouldn't have to scale anything. I do something similar where I create a scene in AutoCAD, using multiple layers, and I use metres as units. I export out using 3DS file format. However, VUE sometimes does not accept full 3DS scenes, so I read the 3DS into AMAPI. This way, I can export either whole scenes or just individual objects as 3DS. Since AMAPI is also a CAD program, it will read in either the scenes or objects using the same scale as the originals. From AMAPI I export out as OBJ file format, which VUE reads w/o any problems. I have no scale issues at all as long as the the VUE "center & resize" option is turned off. You can find a freebie version of AMAPI somewhere on EOVIA's web site, from what I heard. I picked mine up several months ago when it was a freebie in "3D World". AMAPI versions 4, 5 or 6 will do. I had a look at your workflow and that is a lot of steps to go through just to port a file. Part of your problem could be in too many translations.