I modded my Poly 800 by embedding a Toshiba Libretto 50ct laptop and an Alesis Nanoverb where the programming decal is on a normal Poly 800. I bought the HAWK-800 mod and am waiting for it to arrive. Luckily when I put the computer and Nanoverb into the synth I left enough room for the HAWK-800! Here is a demo of my Poly-800. I call it the FrankenKorg 800.
http://www.youtube.com/watch?v=U3Oqk1jU-Oo