TIMING CHAIN NIGHTMARE

[JAX01X5]

Hi guys. I am new to the BMW seen and boy have I picked a doosey . I got a good deal on my 01 x5 4.4 knowing it had a timing issue that the previous owner did not want to pay to have repaired. I researched m62 timing issues and was fully aware of what I was getting my self into but after opening it up today I find that it was far worse than I had imagined. The shutter plate was loose spinning freely, the center guide was broken with absolutely no liner, the right guide was completely destroyed with the only 2" of it left. 3 out of the four cams are of at least 10 deg and this is just the beginning of what I have found. Does any one know how much clearance the valves have before they hit the piston? I have decided I am willing to tackle the challenge and willing to take any advise you guys have to offer. I am posting some pics so you all can see what I am up against. I just don't understand Why people continue to drive there cars knowing they have a major component failure.