Excuse me, everything I have in regard to a 16" OT HW is 33" to the outside of the plank, factory specs. Given bad days and individual differences 34" may be reasonable. My 16' "Yankee" comes closer to meeting specs for short deck 16' Otca, that is, it is 34.5 outside plank to outside plank yet the papers say it is a Yankee. Who knows, maybe it is a short decked Otca and there was an order for a Yankee so it was shipped as such. Anyway, 17' HW's are 34" and 18's are 34.5". The lovely little and rare 15'HW's are listed as 31". 16's have 2 thwarts approximately 28" long. The first between ribs 18-19 or a rib or 2 behind the bow seat, the second should be between ribs 32 & 33 give or take a rib or two to allow for any "small" error/difference. the Thwarts in my 17 HW are both 28.5". The bow and stern thwart in the 18' HW are 28.75 with the center thwart at 32.5". These are nor exact given the compound angle cut on the end of the thwart. I need a 16 and a 15 to go along with my 17 and 18 but I am in no hurry. Just paid my taxes, you know. Hope this helps.