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 PVA used dries thoroughly.
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.