Well...I dropped the DVD player out. From the moment I realized there were wood screws holding it to whatever was behind it, I knew I was going to be disappointed. And sure enough...a gigantic opening...there was actually a wood block in there bolted to the cross bar...

and two separate wiring "harnesses", neither of which look stock. The one that looks like it was spliced in to the ribbon wire was plugged in to the "Dome Light" plug on the DVD player....(EDIT: after further review, the ribbon wire appears to be OEM)

The other one with the thicker black sheath and red/yellw wires was plugged in to the "Power" plug on the DVD player....

And a quick peek under the dash by the driver kick panel shows what appears to be the other end of the black harness spliced in to OEM wires there, and big square things that I assume are capacitors, voltage regulators, or something....

ugh. Does anyone happen to have any photos of what the wire harness looks like that plugs in to their middle Interior Lamp? And any wiring schematics for the Interior Lamps?
At first I thought that ribbin wire was aftermarket, and tied in to audio. But aftter a closer look, it looks like it runs back to the rear Interior Lamp. Maybe is OEM wiring for the interior lamps?
EDIT: Per this very helpful video from
@Kamran Khan it appears the ribbon wire is OEM. I'm assuming I should be good to remove the aftermarket power harness in its entirety, and if I can find a matching connector to plug in to the Interior Lamp, then re-wire it to the ribbon wire and simply plug it in. EDIT: I found the part #.
@Kamran Khan was a month ahead of me in this quest
Need help In identifying this harness for dome light - https://forum.ih8mud.com/threads/need-help-in-identifying-this-harness-for-dome-light.1304968/#post-14820824 . Be sure to get the metal connector pins, too!
https://www.aliexpress.us/item/3256802975546999.html?gatewayAdapt=glo2usa4itemAdapt&_randl_shipto=US
MUD is such a great asset!
Update: Cover plate made from aluminum and I'm covering it w/headliner material, aftermarket wiring is out and just waiting for the terminal connector pins so I can finish up.