we make the USB board in "http://www.potemkin.org/uploads/Pid/arduino_usb.zip
and we find it is very different from your USB board in "http://arduino.berlios.de/index.php/Main/USBAssembly
can it work ? or it is 1.0 and yours is 2.0? Can it use the newest bootloader?
and we can't find "OSC, 6MHz oscillator, 3-pin" , can we use "2-Pin Ceramic Resonator" instead?
And could you open the CAD files of yours board ?
we are in China, the postage is too costly for our workshop , so we want to make it in China, Thank you!