RE: Things you have done to your climber?
My Ol'Man original had a permanent strap connecting the top piece to the bottom. I removed that and now use a removable one. I can now use the top piece for a seat in other situations.
Also, I added a bow holder.
Honestly, the biggest mod was just leaving the darn thing home! I find climbers to be a bit too cumbersome. I like my ladder stands better.
-Mike