The single bolster wagons are more challenging kits as the body cannot be used to help with rigidity. Experience of building wagon kits is recommended, however the kits are well designed and quite simple, building the two open wagons first to gain an understanding of the construction principals plus care, patience and 'dry run' test assembly will produce excellent results. Take care also to pair up and use the correct length solebars under each wagon type, as two different lengths are supplied on the same sprue.