you have chosen the poorer end of the scale where this type of vessell is concerned, Ken.
Billing are notoriously poor for their instructions, and the higher the experience scale within billing kits, the sparcer the instructions become, as they feel that your”experience” will see you through a build.
also, the timber used in Billing kits was always of the poorer stock and not very good quality.
As colin says, you would be better going for a Caldercraft model such as the one shown by colin in the picture..good quality plans, good instructions and fine quality timbers and fittings.
neil.