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@BillB
so long as the tube will fit inside the seat tube you will be fine, you can have some sprung/expanding system to hold it in place as long as it will go in.
lose the screen on a phone and I reckon that must be the most power sapping component, especially a back lit colour one.
Li-Ion batteries are light and should be able to be charged off a dynamo I think, give you a decent ammount of reserve power. the battery in my sony 880i is 3.6v 950mAh, you could easily swap that for a 18650 Li-Ion cell with 2400mAh and you have a LOT more battery life, use the dynamo to top up charge it on the go. getting the alignment between the BB dynamo and coil in the unit could be tricky (wel it will probably be beyond just stuff it down the seat tube and it will work).