Dave, what sort of specialist input do you have at the moment? I think your situation is too big for us to be able to offer much advice online safely. You need the involvement of someone who regularly puts their hands on the damaged parts and knows what they're doing.
I don't think your ambition to return to running is unrealistic, though. Do keep posting your progress!
There may be some people around the forums who have recovered from injuries as severe as yours and have some useful pointers for you.
Cheers, V-rap.