I made this coracle from some plumbing materials I found in a skip. Building the frame was really pretty easy. It is made from ‘Floplast’ PVCU overflow pipe – it’s very easy to work – just heat it with a heat gun or hot water. I based the design on a willow coracle that I had.
Step three - forming the frame
Find the centre point of a lath by balancing it on a finger. Lay this lath (rib) across the seat posts, with the centre point over the middle seat post. Do the same with three more laths (stringers), and lay these over the rib with the centre point over the three seat posts. Drill, countersink and screw these laths into the seat posts. It's important that these screws are countersunk - if they are left proud of the laths, you risk puncturing the covering
Flip the boat over so it sits on the workbench on its base. Lay two stringers between the seat posts, on top of the rib, as with the previous stringers. Nail a couple pieces of scrap laths over the stringers, either side of the seat, to the workbench - outer edges approximately 15in (40cm) away from the seat posts at the front of the boat, and 6in (15cm) from the seat posts at the rear of the boat. This will help you form a flatter base, avoiding a rounded base that would cause an unstable craft
Weave a rib in front of the seat posts at the front of the boat, about 4in (10cm) from the first rib. You may need to unfasten/refasten your scrap lath braces. Bend these to the gunwhale, using your first rib as a reference. Clamp in place. Repeat with 2 more ribs at the front of the boat, and one in the rear of the boat
Weave more ribs at either end of the boat - totalling 5 in the front, and 3 in the rear. These outer ribs don't need to stick to the 4in (10cm) spacing. You may need to adjust some laths to allow these to lie comfortably against one another
Nail and clench, or staple, all laths in place. Cut off excess laths above the gunwale
With your frame built, you can paint your frame now if you wish. If doing so, you should also paint four extra laths with will form the inner and outer gunwales once the boat is covered