thanks for the info Peter, very useful indeed. I tried gerbv but found it difficult to figure out the lenght of the ‘rectangle’ from the two drill holes. however I was able to use the ruler tool in gerbv to give me this information and now I know the holes are plenty big and spaced correctly for my usb part.
BTW get this error when running the Design Rule Check even when I set the wire width to superfine.
I presume this is ok?
-karl