I think I'll sit this one out. I can't imagine the file sizes and storage needs for those images, and that's way beyond what I need. The D700 fits me nicely as a walk-around camera at events and for carefully set up tripod shots.
I don't do studio work and I don't intend to be shooting for billboards any time soon. For very large prints, onOne's
Perfect Resize 7 and the digital printing technology used by commercial printing shops can produce surprising results. Last year, the local botanical conservatory used a pano of the downtown skyline in a seasonal display that I shot with the D700 and Nikkor 50mm f/1.4 lens and stitched in Photoshop.
Using Perfect Resize 7 I was able to produce a TIF file that I burned to a disc and delivered to their printer. The resulting display image, about 12 feet long, looked respectable from distances as close as six feet. That's good enough for me.