Again, here are Duncan’s photo archive for this part of the build.
Here, the joints are ground, four at a time, by staggering the planks.
More detail of creating the scarf joints. Click on each image for a larger version:-
The planks then need to be lined up before being glued together to make the required length, using string against location pins.
Then the planks are glued and firmly clamped:-
The epoxy resin with filler mix is covered in polythene before clamping:-