IIRC, the one that Shado Pilot posted came from an issue of Starlog. Could be wrong.
Either way, "Jackill" blueprints have been around since the 80's. Lots of new info about some of content of his blueprints has been revealed since then, so some of these blueprints are "out of date" compared to the info we now have access to.
I have some of these older ones and they are cool.
However, some of his blueprints have been updated w/ the new info.
Recommended for the sheer "geek factor."