To answer your questions:
1) No, this one has an angled simm socket and you will not be able to close the trap door.
2) Better with an A500 power supply than original A1200.
3) Heat output on the o6o is excellent (low heat) compare to an o4o.
4) You can download o6o libs from many places including
here5) Looks like the batter was removed, could of been from the work PG did???