Truthfully, if it had it to do over, I wouldn't use the Mianne. While it works well, there are compromises that are made that I wouldn't have to make if I had simply built the benchwork. That being said, I'm happy with the Mianne, and it's going to work out fine. I was originally looking for the no mess solution, but as you can guess, that ship has sailed. Now I'm just trying to keep the mess off the carpet for the grand cleanup after we're done at this point. 
There was no mess with the Mianne, but then I added all the rest of the benchwork build!
Ted, no water on these curves so, on the really sharp bull nose we may have to use water to make the turn. The cantilever on the large bump-out is about 22 inches, but there's very little "give" on that when you apply weight to it, I have no doubts it'll hold anything I could possibly put on it. The base fascia is 3/8" bendable Lauan plywood, the top layer will be 1/8" birch plywood.
The fascia is tacked at a couple of places, but 90% is just the grab of the glue holding it.
As for substitutes for the Mianne, I can imagine that plywood beams of similar size to the Mianne would be more than sufficient. If I were doing it with plywood, I'd use the multi-ply I used here for the deck, that stuff is a pleasure to work with. The cost difference between multi-ply and regular plywood is minimal as it turns out, and the difference in quality is immense!
