I always liked this paint scheme. Decals were large but manageable. I think this was the car they put the roof hatch in so he could get out in a hurry if need be? I didn't add that detail.
Add my kudos, nice job! When you really get down to it, an Xacto, glue, and sandpaper (plus 40 years of patience) are really all you need. All the rest just make it easier and more enjoyable, which is why we do it in the first place.
So a little more googling and I find that the Buick and Oldsmobile wagons of '59 have virtually identical rooflines to the Chevy. This appears to be the way to go.