I have completed the tape joints now using the following method: laid out one set of planks i.e. one side of the craft, clamped either side of the joint using scraps of wood screwed though to the bench (not through the planks) clamped the ends of the planks using the same method, checked all the planks were in line then taped the joints and allowed to dry, then clamping a piece of wood a couple of feet long over the joints to support them I turned the planks over clamped them down and taped the other side, note that I laid a piece of PVC down so that the resin did not stick the planks to anything else, next I laid spacers over the planks and laid the second set of planks over the first using the previously taped ones on the bottom as a reference, this ensures that both sides of the craft are the same so I figure there should be no twist or buckle, then clamped them down and taped them turning to do the other side in the same way as before

Joints clamped and taped

All the planks laid out

resin cured and planks laid out in order

Bottom planks stitched together

Dave adding a bit of weight to the situation

Plank 3 getting stitched