Bill - You might want to try experimenting with a doc-type film such like Adox CMS for extreme expansion of a short scale subject. With less extreme contraction than we normally treat these films with, they can give you a full density scale within a 3-4 stop exposure range. I have a curve somewhere I'll try to find and post. I guess the problem would still be extremely poor speed though, compared to an extreme expansion with a general purpose film.