Hmm, you have me thinking and lusting after a digital back(again) even though I know I should focus on the D850 now.
Everything I've read on fitting them to V system bodies is that you basically need to dedicate a body to the back, have the body gone over to make sure it's in 100% tip-top shape with respect to the back latches and such along with the mirror foam, and then need to get the screen and mirror shimmed to have a hope of getting focus close. Is it plug and play?