Hi,
On the Edwardian Steam Launch build, for the first planks at the gunwhale and keel, I drilled small holes in the cedar and used copper coated hardboard pins and brass screws (to avoid rust stains) to attach the planks to the mold boards. For subsequent planks I used wooden clamps to align with the mold boards (use wax to prevent sticking) and sprung clamps between. At the ends of the plank and on tight bends I pre-drilled and brass screwed. To make long lengths of cedar plank, I made a scarfing jig to accurately cut the joints
The cedar was veneered with 0.6mm mahogany, which was initially fitted with masking tape and finally glued and stapled (1800 staples!). the small staple holes disappeared when varnished.
See the Edwardian Steam Launch build for more details.
Ian