i remember for the bigsky race, watching like 12 volunteers on xcbikes that couldnt put seats down drop in so they could do volunteer stuff down the trail. call in accidents and whatnot. but while all the dh kids were watching whispering to eachother..."are they really going to do that?" they did, and they all ate it hard, some then just slid down the rest with bikes, others kept trying. but at least they all had medic kits so they could fix themselves up.
but seriously, bigsky is stupid steep/rocky, i would say thats a big no-no. but you could rent a dh bike, helmet, pads and whatnot and go try it out.
as far as i know they still have loads of snow and they are supposedly making new trails, but i seriously doubt they will be done anytime soon unless i hear otherwise from somebody more informed than me.
i couldnt help you on the insane climbing, but im sure its there, if anything just go to every lbs in bozo and at least one of them will have good info for you.