The Van end pieces have been glued into position. This is probably the trickiest part of this kit to assemble, some light clamping is advisable to hold the small piece in position while the glue (PVA used in this example) dries.
This models roof will be detachable. A small piece of strip wood (not supplied) was placed on the model to ensure that the end sections matched the partitions height.
Alternately, the instructions state that the roof, curved to the right profile can be attached first and then be used as the attachment point for the end sections.
This model has been assembled without being painted to illustrate the process of assembly.
It is recommended that the parts are painted in advance, or as the assembly progresses.
It is quite difficult to paint the inner surfaces once the parts are assembled.