I used grep on the core/svg directory to search for Inkscape and a large number of the files have Inkscape tags in them, but as noted don't have most of the text rendered with fonts (the exception seems to be the part number). I'll continue poking at it until I find a solution that will survive being rewritten by the parts editor (at least I hope I will 
). I'll also have a look at the file format document, it may be somewhat enlightening on what I need to do I hope.
Peter Van Epp