Mr off.
Cut my mtn teeth up there in the early 70's. Don't know much about technical routes in the Id Selkirks other than Fred said something like Chimney Rock is so narrow it shakes. Think many of the north and northeast faces have decent granite slabs - often quite steep too. Bomber proof granite is right. I crab-walked down (belly up) slabs from Pk 7171 above Harrison Lake desceding to Little Harrison. The best friction. Have fun!