Cool! I've got 2 of those kits I'm working on. 1 is box stock, the other is like yours. I did a little work on mine today, and had to modify the '77 nose to close the gap between the hood and nose. Did yours have the same issue? The first one is gonna be straight out of the box, and painted gold, and the second is going to be black and have the screaming chicken decals and German style name decals (kinda like a "Bandit Mobile" for the family).
I never saw the original Type K's, but I did see an after market one on the street. I had read somewhere that a California company would turn anyone's Firebird/Trans Am into a Type K if you had the money.
Nice work on the build. I hope mine turns out as well!