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The plastic port cover rail took a little finagling, but was also removable after a couple screws. It will need to be removed in order to extract the motherboard.
This port cover is likely to help reinforce the ports. This is welcome since these high wear components are soldered to the motherboard and would be expensive to repair. It would be better to have modular ports and not have to bother with this piece.
The CMOS battery is also readily accessible, and just needs to be wiggled free.