A Double Bob Graham - is it possible?

So I have been thinking of my next challenge for 2011...

I don't fancy running around Mont Blanc which seems to be the next step up. As I love the Lakes so much I have been thinking about doing a double Bob. I know that at least 3 people have completed it (one under 48 hours!)

132 miles, 56,000 feet of ascent, within 48 hours.

Is it realistic. How will I know? Anyway, I have put a shout out for support team and will have to make sure that I have adequate navigators and pacers along the route.

So I am looking at a training schedule too and wonder if I can include a run along Hadrian's Wall in March as part of that?