1st pic - looks to be the horn relay connections. A little different than mine but I still have the external VR. See here for pics - http://www.nastyz28.com/forum/showthread.php?t=148920
2nd pic - There should be a junction block mounted behind the battery for that connection
3rd pic - IDK...
I did a write-up on my install of the Pypes system in my progress thread beginning on page 13 - http://www.nastyz28.com/forum/showthread.php?t=180589&page=13&highlight=orange71
Long story short - great stainless steel kit for the money
This is what I sent you in your PM. I added it here to give others a look should they search the same thing.
Measurements are of the hood only:
Back width - 16.25"
Front width - 11.25"
Gap width - 6"
Tip - when you lay the outer edge out start from the back and make sure the tape line follows...
I have the Range device on my '13 Silverado. All 8 cylinders working all the time...no slackers!
Installed at about 5000 miles. Has 25,000 miles now and no oil loss through 5000 mile oil change intervals.