sorry i'm late to class
as i look on this pic i am reminded of a line that gets repeated often in the plans/instructions from Jim Michalak
MARK CENTER LINES BOLDLY
this procedure allows builders to keep track of the effects of their work on an assembly
i have placed a sheet rock screw dead center on the bow/stem and stern/transom of builds since reading this instruction and it aids in seeing and measuring the "squareness" of a hull as it progresses
there is a slot in the tips of tapemeasures that hooks conveniently over the screw head(centered) that can be used for measuring diagonals
for pointy bow'd vessels measuring diagonals emanate from dead center fwd going to the aft corners
on prams the diagonals can be measured in both directions
keeping a string line/center line aids in casual monitoring
WEEZER, Great beginning
now onward thru the thread
sw