So explaining again.. for images... -DOWNLOAD ALL THE PACKS- Better yet if you go to the TFGS page and download whatever "old" Images files are posted there if you are possibly missing any. Not sure how maintained the F95 download image pack is.
Then make an Images folder where the .qsp gamefile is, and put them in there. The only pictures that are known missing are some of the character face images for some hair colors and the ponytail hair style. Any other missing images might actually be a missing an image pack, or not yet developed content.
As for Rex, yes, starts as a shemale, can then either continue on the fem path to get a vagina, or can "resist". Theres more content of course for the fem path than the male one, but there are some there.