I'm in if you'll have me.
And now from some thoughts:
Perhaps you could break the piece into movements to cut back on having one large file.
E.X. Beethoven's 9th - First Movement
Beethoven's 9th - Second Movement
...
Most classical pieces have musical movements to them so it could serve as a natural break or transition for the finsihed product as well as help with the issue of 'one giant file to rule them all'.
I'm not sure how that would work, I've never heard all of the 9th Symphony.
Another idea would be to author a DVD and have people pay for postage, assuming no other acceptable alternitive is found. This is an extream case however.