Hi Denis,
I am in Cobourg, a couple of hundred metres from Lake O. The Belhaven caught my eye also, but I am not certain about the cabin profile. It may be just the semi 3/4 photo angle that makes it look a bit stout. I would like to see other photos.
Regardless, my build may be postponed somewhat as I have some SWMBO projects to complete and a shoulder tendon to get repaired.
I do like the Bolger and Welsford designs too but have not looked at Michalak's designs particularly. The current Small Boat Journal has an article where the author praises his Laguna so I might have to look more. Being an ex-dinghy and Kirby 25 sailor, I can't get excited about sssssslow boats. At the same time, I do not want to wear myself out. Contradictory objectives. ;-)
Thanks,
Paul