
@JonnyCat: The only Uffa Fox <-> George O'Day design dispute that i'm aware of is the cuddy. Uffa designed the DS with a flush deck and maybe a breakwater, George wanted a cuddy to make the boat family-friendly. That all happened on the drawing board only, pre-production, "Gen0" so to speak. The difference between "Gen1" DS1's and "Gen2" DS1's is the seats, they were wood planks early on (until 1960 or '61) then they were molded fiberglass. This was purely a George O'Day decision, for more flotation and easier manufacture. For the truly detail oriented, there were lots of little variations between the early boats - different keelsons, bulkheads, molded cleat pads, mainsheet bridle attachments, jackstays, etc. Some of it is documented in the "DS1 Design Changes" thread, including a spreadsheet (first entry has a link). Personally, I'm suspicious that the early boats were finished off with whatever spare parts (and sail numbers!) the shop foreman had in the bin that day. But there was a lot of experimentation and making do as well, it's not easy maintaining a 30-year production run!
Tom