I was just looking here:

1985 Estes Catalog

I'm really taken with the NASA Pegasus model; however, I can't find plans for this one. JimZ lists a part number 0806 Pegasus, but not this no. 1376 NASA Pegasus. I can probably get pretty close from the picture, but I'd sure like to see their fin patterns and alignment guide.

EDIT: I also really like the Scorpius here. Same situation though.

I admit I'm wondering about the stability of Scorpius...