For what is worth I use RhinoCommon to export to pdf (line drawing), I generate all the drawing in a single PDF.
To draw bitmap
https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_FileIO_FilePdf_DrawBitmap.htm
So you’ll have to find a way to place your object, set them to the good scale,
capture this image
https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Display_RhinoView_CaptureToBitmap_4.htm
here my script, I use also a lot Elefront.
04_to_pdf.gh (125.3 KB)
Some more explanation here
Working also on an other project I ended using Tex in order to have a nice document with image not embedded inside, then I “bake” this Tex to PDF.