I also used a technique to help scribe the bottom to the floor by turning the benches over and using a reference off a flat surface to define the height. Here it is
These came out to be about 18,1/2" high which is also a good shop stool height. bonus. Honestly i'm not sure how much hand sawing I plan on doing with these benches but they are going to be really handy while staging boards during various stages of their milling process. also a good height to post something like a cabinet when I need to apply finish, or hardware etc. Today I used them to brake down a pallet languishing next to our house using both a circ saw, and a pull saw. these were a perfect height for this sort of adventure.
in total, a productive way to spend a few spare hourse in an afternoon.