Haven't rendered a standard DVD widescreen video lately with all of the new selections available and wonder what the best selection might be to render 1440 x 1080I from the old Sony V1U.
There is a template for a DVD Architect compatible MPEG2 file.
But the scaling from Vegas will not be the best option - especially as interlacing is involved. I don't know if the new smart scaling plugin does a better job - it didn't work for me.
You should try and set the project properties to double NTSC, progressive and de-interlace method to interpolate, leave resample on for each event. This will first interpolate the frames, make a progressive double NTSC which easier scaled to SD interlaced.