Allot of the design of this hinged on the materials we had available. We switched the rear seat support from a 3/8 inch rod to the shelf brackets when we located this extra thick mahagony in the shop. This stuff is 7/8 inch thick, so we can take 5/16 out of it for the groove that the pin runs in and still have a decent amount of material left.

As you pull the seat up and out of the stowed position, the rear pin rides up this groove until it gets to the angled top. There is an aluminum strap on the top that keeps the pin from going too far. then when you release the seat, the pin slides down the angled top of the block and comes to rest in the seated position.

We added a small block to the far side of the top of the block, so that when this is assembled from the side there won't be a gap showing. (More pictures of that later as we assemble this in the boat)