I've got an 18' OT Guide in the shop without thwarts and need to know the standard maximum width (preferably from outside edges of inwales). Anyone able to measure yours and let me know?
Bow and stern thwarts are contoured to match the plan of the boat and beveled - see pics. So the longest dimension on top is 30" and on the bottom is 30 3/8".
Center thwart of course has no bevel and is straight-sided and is 34" long.