Someone made a model of an Orion (modern small version, but Orion nonetheless) for the Orbiter space flight simulator.

Well, who wants to test fly an Orion?  Be carefull tho, Orbiter is noted for be a stickler for realistic flight and is very dificult even when you have everything precomputed so you just have to push the buttons when your stopwatch says.  And anyway, you miss the scenery that way.  Note: the guy who made Orbiter used to work for NASA making these simulators, so he does a very good job.  Mabye we should convince him to help promote Project Orion and Nuclearspace.com?

http://www.medphys.ucl.ac.uk/~martins/orbit/orbit.html  Orbiter main page.

http://www.orbithangar.com/download.cfm?ID=938   Orion2100.zip  the scn, mesh, gfx, and other sundry files for simulating an Orion

These are the minimum requirements to run ORBITER on your computer:
300 MHz PC or better (Pentium, Athlon, etc.)
128MB RAM or more
Windows 95/98/ME/2000/XP
DirectX 7.0 or higher
DirectX compatible 3D graphics accelerator card with at least 16MB of video RAM (32MB or more recommended) and DXT texture compression support.
Approximately 60MB of free disk space for the minimum installation (additional high-resolution textures and addons will require more space).
DirectX compatible joystick (optional)
There is nothing to prevent you from trying to run Orbiter on a computer with lower specs, but the results are not likely to be satisfactory.