Yeah we decided to push the b-pillar back quite a bit for a few reasons, seat clearance being the biggest one. If you keep the b-pillar in the stock location you end up having to bend the shoulder bar around the back of the seats, or weld it to the horizontals going back to the C-pillar. It also makes putting the diagonal cross bracing in really difficult. You also end up with the B-pillar right next to your head if you move the seat back any, which is not so great in a hard roll. By moving ours back we are able to keep everything nice and straight and strong, with lots of room for occupants.
Here's how the passenger seat mount came out. At first I really didn't like how it was working out, but I just kinda went with it, and now that it's finished I actually like it. I also got a lot of the passenger door bars done.