These frames are sick designed alongside jack fogelquist with his input they even come with a Mont to put the shifter on the downtube hope she rides nice dude stoked for you
Well, it only has 100mm out back (I run 130mm up front) so she's certainly no DH rig, although I do ride smoothish DH runs and she's quite stable and handles hits well, but I wouldn't be punishing her with gnarly rock-gardens or anything too rough.
Irrespective of your weight and height, If DH is your thing? I would recommend looking for something else. I dare say, before too long you would find yourself wanting a rig thats more capable at soaking up rough stuff and definitely more travel! I find the Rook a great little play bike, loads of fun to throw around on relatively smooth runs, but it's no DH rig!
It's a whole load of fun on a 4X track and if you plan on hitting up SS features, then it's a great rig! Dude, at you age "Never say never" if you really want to be a racer YOU CAN be a racer!