back to original topic, no I would not do it.
I would paste the solar panels on the back, and wire them directly to the USB port.
That way you don't have to open the device, and can unplug the panels at any given time!
I'd also install one large panel covering the whole back, not just the top.
Chances are you will cover at least one panel with the hand, and from the light they are receiving (usually reflected sunlight from the floor) it will need a more powerful panel!
It is a nice hack though that I am considering on doing, but through the USB port, not through the back plate!
I think this solar panels will be more suited for the job (seeing that they never will receive full sunlight):
1-
6V 200mA
2-
5V 130mA