These types of challenges are extremely difficult to achieve, especially if you adhere to strict bankroll management, which I believe Doug is. I said this before earlier in this thread, he's an underdog to achieve this challenge. It's not because he's a bad player because clearly he is not. The reason he's an underdog is primarily it's going to take such a long time to achieve this, and I think that he'll quit the challenge before going busto.
His bread and butter is the higher stakes games and I can't see him dedicating that much time on stream to playing the micros. That is unless he plays off stream in the higher stakes games.
Another thing to consider, if this was easy to do, more people would have done it so far. I do hope Doug proves me wrong and achieves this goal, but I don't like his chances.