100 inches to represent 1000 ft of ship. That was Richard Taylor's call, that scale, and the stated reason for discarding the mostly finished PHASE II model.
The EVENT HORIZON miniature was 30 ft long and shot mo-con. That's bigger even than the MISSION TO MARS and SUPERNOVA ships by a goodly margin, probably 10 ft longer. I saw the M2M ship up close and was surprised that it didn't look as good as it did on film (as opposed to the E-E, which looked great even without the lights on, and the PHOENIX, which was like the most beautiful foil covered jewel you could imagine, especially with the nacelle caps.)
I don't know that Trumbull would have built the whole thing at his preferred scale or not (even though that seems to be the inference, because he mentions the SILENT RUNNING VALLEY FORGE was 26 ft long.)
I could easily see building a really huge midships partial, where you' have the top of engineering, the struts going up toward the nacelles, the main strut and a hunk of the underside of the dish. That would have allowed for the kind of shot I've always dreamt of, where you could do a tilt up from engineering to the dish that went through at least 150 degrees of tilt, which would be enough to get you dizzy if you shot it right, and provide immense sense of scale (which is a real toughie given the smooth-skinedness of the thing.)