Well, some of the V3 outfits do have useful accessories. You can use the BFGs even if the combat swimsuits don't fit V4. An interesting thought: I've used the Project Z set a few times, and it has options for V2 and V3. For V2, you have textures for the catsuit. For V3, you apply textures to V3 and use the Spandex morphs. Both approaches work. Now, I don't expect this item to be updated for V4, although if there were a UTC plugin for V4 I could try the texture method. But does the full version of V4 have anything like the V3 Spandex morphs? And there's not a catsuit yet. You can get wrist and ankle effects with displacement mapping, but you can't get the effect of fabric over the breasts so easily. That's one example that shows why I think dropping V3 is a little premature. But surely you can access your old P6 runtime from P7. (At least the Wardrobe Wizard support is there, now. And the V2 catsuit does seem to convert well. I've used it for Miki, A3, and Furrette.)