first I bought two the same keyboard .
Disassemble the keyboards layer by layer..
take the cover layer of keyboards and cut them with a drill cutter tool.
cut the keyboards by two pieceses with a drill cutter tool( attention of the keys that you need the save
assemble the halves as left and right.
fold the flex circiut under the cover. and fix them there by hot slicon .
unfortunately I have to use 2 usb ports by this .