When it comes to real-world hardware or designed but never flown air and spacecraft or questions about propulsion systems real or theoretical aerospace engineer and spaceflight historian Scott Lowther, author of Aerospace Projects Review, is a bona fide authority.
I consider technical drawings to be an art form, art raised to an exacting level of precision, and Scott is a master of the craft.
In Aerospace Projects Review issue Volume 2, Number 2, available here Scott offers a beautifully illustrated 56-page article on Project Orion. This is one of the most definitive articles on the subject, covering the large designs, 20 meters and diameter and larger. The 4,000 ton nuclear pulse propulsion orbital battleship design for the USAF is shown in never-before-published detail. Scott was able to interview one of the surviving members of the original Ge