Do a web search on "close range photogrammetry". I've been away from the business for a number of years, but I do recall that one company made a heavy duty bar to hold 10"x10" cameras at the correct distance. Rollei, Hasselbald, Wild, Kern, and Zeiss are some of the companies that build things that might work. Don't use the photogrammety cameras though - unless you want grid lines (like NASA moon walks) in your image.

Also, contact http://asprs.org and see if one of their advertisers or members will lease the equipment to you.

Kevin.