Im currently building this one as well. My difference is I took some out of the bed. It just looked too long in the stock form (building the C cab as the hot rod version). On the stock version, my rear wheels set a little too close to the rear fenders for my liking, so I will have to do a little modding to move them back a bit. Overall, its a pretty decent model, without many fitment issues (the front suspension can be a little tricky on the hot rod version).
The grill pictured is for 76-77. The 73 -75 had different centers. They had the round headlights, but no bezel (square) arond them. the center went all the way to the light itself. the square headlights were used on the 78-79 years. I had a 73 Highboy (4x4, 3/4 ton) that I partially restored.
Got to add that it is the original packaging that makes most toys valuable. I have some Star Wars stuff thats worth a bit because the plastic clamshell it came in is undamaged (I know star wars is different from hot Wheels). Its almost the same with guns. I have some nice rifles and the nicest one, I didnt save the box. Its still worth a bit, but would have been worth more with it (it is a gun I will never fire)
Very cool concept. Im glad on the other hand that they didnt make these in 1:1. We have a 2014 challenger and seeing yours, I could only imaging the blind spot on this car (the Challenger has a terrible blind spot on it, sucks when backing out of parking places). I love the car on everything else.