The designs for the transmission can be found at
http://www.nrg948.org/pr/2 Speed Ball Gearbox_0.2.zip, feel free to download them and look them over. They were made in Inventor 6, but I believe the newer versions shouldn't have too much of a problem opening the files...
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Nice Inventor work! A+ for the gears and sprocket if you made them yourself?
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Nope - many thanks to FIRST CAD library for their excellent work.
Hehe, it's funny that you recognize it... I had your white paper on this type of transmission open for reference the entire time I was modeling

Obviously your ideas are present all through the design.
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Any idea how your side plates are going to look and what tooth count are your gears?
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I modeled the side plates as well, but took them out in the rendering so that you could see the inner workings of the shifting better. The larger gears are 60T, the smaller ones 35T. The gears on the drive outputs are 14T.
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One thing that could shed some wieght would be to get hubless gears or machine those hubs off.
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We will definitely be doing this, at least for the keyed gears, in the actual transmission.
-Jake