Looks great, bluemonkeyflyer.
I have a pair that are going to get woodied once Canada Post finally gets my wooden cups here. For now, I have a pair with the stock felt still on the back. I'm considering doing some more modding in there to compare the stock felt vs. other felt behind the driver, but I'm not sure I want to take the Sony pads off my current T50, since they need such different damping schemes.
At any rate, if I learn anything, I'll be sure to post it here.