Pocketship hull hardware package

I’m finally getting to the point where I can start installing the hardware for the PocketShip hull. But I’m confused about a couple of items. First is the 36” threaded rod. The list says it’s for the tabernacle and bowsprit. Is that what I use to attach the bowsprit to the tabernacle? Am I cutting that to length? Is it also what I use to attach the mast to the tabernacle? Finally, Why are there are two sets of 3/8 2” hex bolts for the center board sheave? Any help and suggestions would be appreciated!