I'm building a Station Wagon right now, too. Mine was a wagon to begin with and it has a body that was crafted in New York. Putting it together has been a guess-and-by-golly adventure because there is not a set of "plans" available at the Station Wagon special interest group ... or elsewhere that I can find. There are lots of drawings in Woody Wagon's Newsletter that have been published over the years. Back issues of the news letters are for sale.
I've been fortunate to see several "Henry" winners. Each one is beautiful. But they each have some interesting departures from the others. All this is to send another pic of the seat/door jamb angle bracket. These are swapped side-to-side from the previous example. That puts the side of the angle the seat bolts to about an inch and a half to the rear. My tummy demands every fraction of inch of comfort, so this arrangement is BEST (IMHO). Again, the car around the bracket won MARC's highest award ...