"What would be the prefered hull to deck joint?"
For the limited plans you have for the boat, I''m not sure any method - suitably done by the buider - would need to be avoided. OTOH the best choice IMO is for a deck joint to be glassed over after the two molds are mated in some fashion. Absolute strength and water-tight integrity, no matter how old bedding compounds get. N Europeans seem to be the builders who choose this method.