If you did all that leatherwork in an hour, I am super impressed. They look great; a lot better than the plastic chain covers I am used to seeing.
How did you like the Mar-K kit? I have looked at it a couple times and agree that it seems fairly expensive for what it is, but it is cheap compared to fixing or replacing a creased tailgate.
I also toyed with the idea of getting some tailgate cables from an 03-06 silverado and trying to retrofit them. It would be cheaper but a lot more work.