Here's mine with the pickguard just placed on it. I still need to make my own 3-ply version (will attempt that tomorrow), so I can reshape it if necessary.
Here's a '66 SG Jr
They aren't that different. It's more that on the '66, the bevels are wider (even though I've increased mine a bit) and the guard follows the inner curve of bevel on that bottom edge for most of the length.
So I'll probably/hopefully do a modified version that follows my bevel better and fits the horn a bit better as well.