John won't be concerned with maintenance - just the results It will be a challenge and that is what he is after, he will pull it off and it will be a "widely" discussed work.
John I think it is a great idea. I assume your are looking more toward a Saikei and not a Bonsai Forest. And the discussion regarding the trees is appropriate. However, from an appearance standpoint I feel the trees are secondary to the hard (rock) structure and the resulting soil hills and valleys and low plant life. No matter how great the trees are they are secondary to the structure they are on. OH I wonder what Arthur's comments would be. And of course a new video is demanded.