No, absolutely not.
However, I'm a great bracelet re-sizer/upgrader and I'm pretty handy with a NATO or Zulu strap!
But that's not really "modding" is it? Seriously, I have neither the skill nor the patience for anything that intense!
I did purchase a modded watch (a movement and crystal upgrade on a Gen-1 Monster), but that was done by a guy who knew what he was doing and it was really more of a performance thing, rather than a design...