Go for it. I don't know about FireFly but I loaded the original yatch (which is actually 513,433 polys), 1 V4 & 1 V3 (scaled down to 6%), clothes, hair and textures - roughly 730,000 polygons - no problems. Then just to see what would happen I loaded two yatchs in a new scene. It took a few minutes to render but 1,026,000 polygons and change didn't faze the old lady. I suspect adding a full crew of bikini clad Vickies to both would break something badly though :-)

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken