Ah ... 35 objects, eh? I suppose that's possible except, I opened one file which only displayed 3 objects, so not sure. There are conversion reports which revealed "No resource for drawing information found., No resource for ruler information found.", so perhaps that was the problem. But I was not particularly impressed with the application either ...
I would presume you make a PDF the same way you make one on any Classic Mac, i.e. use the LaserWriter 7.0 or above driver and print a postscript file. That opens in Preview which you can then save as a PDF. While your method is more, uh, "authentic", I prefer the fewer steps of using Mini vMac and importing the files and exporting the postscript file for use with Preview.