Start out with a 1395162 keyboard. Open up the chassis and pull out the controller and cable.
Find a 1398011 controller. (A controller from a 1391401 keyboard.) (About $20)
Replace the controller with the new controller, attach the cables to the controller.
Fully functional keyboard as it sits.
Edit: You can also order a replacement SDL detachable cable from Unicomp for $15, or buy one of Orihalcon's SDL to USB cables.
http://www.pckeyboard.com/page/Cables/1395110http://www.ebay.com/itm/BEIGE-USB-to-SDL-6-Pin-6ft-IBM-Lexmark-Unicomp-Model-M-Clicky-Keyboard-Cable-NEW-/271470078682If you feel ambitious enough, get a LED Overlay from Unicomp ($1.50). And get the LED assembly by ordering a Membrane assembly and putting in "LED Asm P/N 13N3297" for the part number. ($10)
Attach a 4-Pin header to pins 9-12 on the controller and 1-4 on the LED panel.
You will need to drill out the holes for the LED lights to shine through. Carefully line up the LED Overlay where you would put it, and mark the center of where each LED is. (I use a black marker pen and make a + sign where each one goes. I also use a hot tip from a soldering iron and make a small indentation in the plastic for a guide for the drill bit.) Drill the 3 holes. Smooth the burrs and put the LED Overlay in place.
Project is finished. The keyboard looks and functions exactly like a 1391401, and you have a layout identical to one as well. (The only minor difference is the
+z on the + key on the numpad, and the Setup underneath the - key on the numpad. Kinda cool looking, actually.)
This is just a fun project to me, but I thought I would share how it's all done. I'm sure someone will find it useful in the future. Those terminal boards are a good deal, but take into consideration the cost of doing this project as well if you decide to get one. Enjoy!
Edit: I went and found some more pictures to illustrate how the panel is done. They may not be from that particular keyboard, however.