Benchwork design help: Second level of the mushroom...suspended from ceiling?


Okay everyone, here's my dilemma. I didn't fully think about my design before I started building it and now I've run into the problem of not actually having enough room to support my upper deck from below in a few places, so I'd like to run a couple ideas by you and see what ideas you have in turn.
So my first idea, which will work on one side of the mushroom but not both, was to have 2x2" supports coming directly up from the floor to meet the bottom front of the benchwork for the upper deck and support it using the kind of plywood supports Mike Danneman is using, while the rear would be supported by 2x2s coming down from the rafters in the ceiling, like so:

http://hostthenpost.org/uploads/e8c3bb3375cd1c3858b4aa0d93aba672.jpg
Now, on the other side there's only space for a support at each end of the peninsula, so there would be about 10 feet between the two supports. It would be fully supported from the ceiling, like so:
http://hostthenpost.org/uploads/9247aa775e61f28c651077918b8e5cba.jpg
The shelf itself would be composed probably of 3/4" ply cut into 1x4s making a frame, and vary in depth between 16" and 24".
Here's a screenshot of the plan for the upper deck:
http://hostthenpost.org/uploads/656c85720e84b4034902e3e4ceaa742f.jpg
One thing to keep in mind is that Farr Creek Bridge will cause a depression in the framework, and the left side is the one that is harder to support from the floor.
Okay, ideas? Criticism?
 



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