No one we know of has modded one, all owners have theirs stock. I think Wualta cant even open his any more if im not mistaken (stripped a screw?) You have to be careful with those screws.
To save you time and finding a modder, id reccomend you try my earpad idea first.
Btw dBel: the diaphragm isnt lighter than the rest, its the same as the T50v2 and T50v2 oem's, and even T30 I think. Its just the tensioning of the driver thats different. Iv had a pop at all of them bar the v1.
And boilermakerfan: that NAD is a beast, I can help you out as I own one too.
Looool, I only broke it once thank you! , and that was because I was a pioneer in figuring out how to open an unknown headphone .
Will be interesting to see how the modifications improve it! or if you realise stock is best.