The Orion heavy cruiser was my favorite of the Stardate 3000 line. Quite massive looking, with an air of 2001 A Space Odyssey about it. It and the other ships of that line were featured on the playing counters for the 1977 boardgame Alpha Omega, but only ancient game geeks like me have ever seen this game.
On the drawback side, I have no blueprints for this, just the physical model. Since my eyesight isn't what it used to be, I'm using a 15x jeweler's loupe in an attempt to see the details. On the advantage side, the miniature masters were composed of glued-together HO gauge train parts. This means that in several spots on the miniature they re-use train bits, so once I make a mesh model of one particular bit I can re-use it as well.
Using HO train parts was apparently quite common in the 1970's. It was done by Valiant for their Stardate 3000 line, Superior Models for their Starfleet Wars line (now available as Monday Knight Productions' Galactic Knights line), and by Pewtercraft's (out of business) Galaktik Taktik line. The Valiant line was sculpted and fabricated by an artist named Rodney Carter back in the 1970's. If anybody knows the names of the artists who sculpted the originals for the other lines, please .