Hi all,
With regard to holding the bottom in place while the glue dries.
I edge glue 1 1/2" inch strips of deal together to make up the sides. When dry, I then mark the hull shape onto this board leaving at least half an inch on the off cut side. I then cut through the line carefully to produce the side pieces. Then I glue the sides to the bow and stern pieces and leave to dry. (probably as every one else does so far).
I then glue up and position the bottom board. To hold it all in position, I just use one pin on either side at the deepest point and then G clamp the off cuts back to the original board positions with the bottom sandwiched in between. This system leaves no awkward angles as the whole thing becomes a rectangular board again. To hold the leading edge in position I screw a temporary scrap of wood under the hull through the bottom to the front cross piece. At the stern, I use a scrap piece of wood just clamped in position.
At the moment, I am just finishing a yet another standard Springer for a friend, and then I want to make a stretched version a previously mentioned "Springalong" or "Springerlong" Not sure of the spelling. I have a toy working crane I think would look great sat on top.
Bob