Today was Sunday and I got a few hours in the garage:
The big rear sprocket is mounted and has just enough clearance around the swing-arm. I suspect this was not by accident, and it explains the 71 tooth max - #50 sprockets have a bigger diameter than #40 sprockets, a big "DUH" pointed out to me by John Bidwel (El Ninja) in email after it thankfully worked out for me.
- I put the 2 chargers I have on a particle-board
cover that bolts like a table to the top of the battery cage. I use zip ties to hold the parts in place. I'll go aluminum with it if it works - I would like to mount the chargers lower, but the ability to pull them off as a unit is appealing, and I will do my wiring to allow convenient disconnection from the chargers to allow this. 
I washed out the tank with soap, took off the tank hardware and started to try cutting out the bottom. I am doing this to save weight, provide more clearance and do something clever with the hole in the tank - maybe a big e-meter guage or extension cord housing or something. Cutting the tank is really tough with my little hacksaw blade holder, I need to call up Brian with the sawzall and angle grinder.
- While looking for ideas for efficiently cutting a motorcycle gas tank, I ran across ads for "Tech Shop" and "The Crucible", places that offer machine shop/welding classes. Tech Shop takes it to a whole new level by providing access like a gym membership or something, would be quite handy if they were not in Menlo Park. Looks like the Crucible set a World Speed Record with a Diesel Motorcycle.
- An updated picture of the battery cage. Notice the cross bracing and top rails.
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