Hi, Steve - the Bullet is, as far as I know, the only high aspect ratio hollow log. While most of Walt's designs were in the 18 to 20" span range, the Bullet is just over 25".
I'm not sure if it was ever kitted or just a design - Larry Rice would know.
It's really a great flyer and as long as the weights are kept down, in the 4 to 5 ounce range, they fly quite well.
Here is a photo of the plans.
If anyone wants a copy, I believe Walt still sells them.
Bob Z.