Here are the files you will need:
/usr/photon/bin/Photon
/usr/photon/bin/phfont
/usr/photon/bin/phfontpfr
/usr/photon/bin/pwm
/usr/photon/bin/pdm
/usr/photon/bin/phlib_s11
/usr/photon/bin/phlib_render_11
/usr/photon/bin/Aplib_s11
(the following 5 files should be setup using fontcfg)
/usr/photon/font/fontdir
/usr/photon/font/fontext
/usr/photon/font/fontmap
/usr/photon/font/fontopt
/usr/photon/font/mappings
/usr/photon/font/phcursor.phf
(any fonts you will want to use, likely: helv 10 or 12 regular and bold)
/bin/Input (this is part of QNX, just ensure that it is there)
/usr/photon/keyboard/ (include any .kbd files you need to define keyboards)
/qnx4/photon/bin/crttrap
/qnx4/photon/bin/inputtrap

By my calculations these files will come in under 2.0 Megs.