could anyone help. am i doing this correct?

to use a .vob file and still to keep the yuv color format (meaning that it is not converted to rgb)
i do following.

i load the .vob file via DGindex the save project as .d2v and then load following Aviscript in Premiere Pro 2 (I have installed the Avisynthe Plugin for Premiere Pro 2.0)

LoadPlugin("C:\Programme\AviSynth 2.5\plugins\DGDecode.dll")
LoadPlugin("C:\Programme\AviSynth 2.5\plugins\SmoothDeinterlacer.dll")
video=mpeg2source("C:\My Documents\tempo.d2v")
audio=wavSource("C:\My Documents\tempo T01 2_0ch 448Kbps 48KHz.wav")
audiodub(video,audio)
ConvertToYUY2()
AssumeFieldBased()
SmoothDeinterlace(showlace=false)

then I output the video from Premiere via Frameserving using DebugMods Frameserver (I select "yuv") to Procoder Express and create an .m2p file.

any ideas on this?