Moving this discussion from "First Pics".
First trap measurement = hounds to bow tang. Set the trap at that (add some line if you need to)
Second trap measurement = First trap measurement moved aft to where it touches the deck. This is hounds to deck aft measurement and is equal to hounds to bow tang at foredeck measurement.
To be sure, you measure physically to the tang (bow), then to the center hull (aft); ie the aft measurement might be to the center of the deck hole (not from center hull forward to center hull aft -- which is okay if we keep consistent but does result with slightly different calculations).
When we compare numbers should we measure from the rear beam centerline? Might be easier and more accurate to measure from the aft-most part of the aluminum beam.
