I tried opening the first twinned image in AgiSoft StereoScan.  The 3D model it created doesn't look completely crazy (see image below).  It can be exported as a *.ply file. (the format we think could help us with photosynth), but we don't really know what we're doing with those *.ply files and these won't have nearly as much stream outline included as the multi-picture photosynth ones. 

screen shot of first twin set