vbGallery is essentially a dead script yes for sure considering vBulletin 5. I already know at the minimum we can support PhotoPost Pro with login and css/template integration at the minumum. Given how vbulletin 5 is written and the changes in regards to how there header footers and general system works I see no feasible way to port vbGallery to that system. It took a year and a half of resources to rewrite vbGallery to work with vbulletin 4. Fiscally I do not see how that product line can survive.
I know how you have to create w separate plugins but if your asking have I personally done it as of yet the answer is no.
I may have a different answer given some free time to do it.