I'll need to check tonight, but I think mine is finished like that......
I cetainly have the overlap between the toob & the hull like yours, and I do get a small leak (which I think is actually starting a lot further up the joint towards the bow) but that's after 30 years use!
Built 1984, and it's 1.3m shorter, but is the grandad of the O-Pro & it ooks like the Hull - toob joint tech hasn't changed.
In the meantime I think there might be a pic of it on the trailer in the "Show us your rig" thread, but probably won't be too good a view of that corner of the hull. Will try to post a pic tonight, but may be later in the weekend by the time I get round to it.