GenRight’s directions say to first position and tack the B-pillars that go behind the front seats, however we began by placing the assembled side tubes onto the A-pillar stanchion and C-pillar rear plate mounts. We used bungees attached to the ceiling to hold them upright. This allowed us to eyeball the correct positioning for the B-pillars, which are the keystone for the whole cage build. It’s pretty important that you get them tacked in the correct position. Once the B-pillars are in place, the rest goes together pretty easily.