Thanks for the responce to the table. I have updated the post with full size photos.
Chris, the hinges were OK to fit once I know the radius of the rule joint and cut the slot for the hinge pin that distance from the edge of the centr board (15mm in this case.)
Mack and Paul. I haven't tried anything without straight edges yet so I doubt if the chairs will be made soon, but one day I certainly want to have a go.
Steve