I was thinking about putting a handle back there for the same reason. LOL
The knob on the glovebox is just a wooden cabinet knob. Whatever works right. It looks good, and has been on there since before either my buddy or I had the truck.
The dash is how the GMC's came. The rest of the interior is silver, and the top of the dash is charcoal, according to what I have read.
It doesn't look like the holes by your visor are big enough for a spotlight from that picture. Do they go all the way through? Maybe an antenna wire?
I didn't notice your awesome carpet too! LOL Not quite a cool
as what was in mine though! LOL