Phil,
First, thank you very much for sharing this information and doing this for us. I hate to be the one to throw a monkey wrench into the mix, but my truck seems a bit different. It is a 2014 Silverado LT 4x4 with the jump seat from factory. It has an audio port, two USBs, SD Card slot, and one 12v cig inside the jump seat console. The rear of the jump seat console has another 12v cig outlet facing the rear seats. The dash, next to the ash tray, has another 12v cig outlet and a 110 three hole plug. There is NOT a USB port anywhere in the glove box upper or lower sections.
The new console i have sitting in my dining room does not have the SD Card slot - not that I have ever used this anyways. If you are located in Dallas, I would love to come up there from Waco and let you supervise my console install. If this isn't possible then I will give it a try solo this weekend using the splice method.
Thanks,