I got the front pedestals welded in for the seat. I still need to put some in for the back, which the seat will rest on when folded into driving position, but I am going to hold off for now. I may need to integrate them with whatever seat belt mounts I go with. The particular seat I am using doesn't really need them since most of the weight is borne by the center mount.
Next on the list will be some undercab mounts that will attach connect cab to frame in order to provide more support for the center seat belt mounting points.