So you got part of it for sure. The hubs on a Titan (those are Titan wheels) are like 77 something, nearly 78. Your Xterra is 66.1. So you may need hub rings. My concern would be the offset of those wheels since that set up is about 2" taller than stock and damn near a 33.
Good idea. From that screenshot you can see that his plastics are removed, and it looks like the fronts are trimmed pretty heavily. Id say that his front is lifted as well. Definately could make those work, with some work.
Your main concern is going to be the front auto hubs (assuming you're 4wd). They're pretty big and requires a large center bore on the wheels. Now. You could eliminate them with drive slugs off of an 04 Pathfinder. And then they wouldn't be a concern anymore but your mileage will suffer since the front axle will be rotating all the time.