Yes - drilling is required. But - I managed it and am truly crap at this sort of thing!! KTM has an adapter mount that works with the Touratech mount (this part bolts to the cockpit subframe). They sell damped and non-damped ones. I went for the damped and it works great.
http://www.touratech-usa.com/shop/show.lasso?SKU=065-0142&-session=touratech:47287E89079e81C359OKw1CA94F7
http://ktmtwins.com/950adventure/040-0662.html
Enjoy - Wolfhound