I think I have found the ideal Raspberry Pi enclosure for the model B+ and the promised model 2 which is due to be launched in Spring 2015. All will be well next Spring presuming that element14 adhere to the B+ form and the components actually align with the existing apertures of the case.
The design allows the student access to the GPIO pins and the camera and display connectors by easily removing the lid. The raised pillars on the lid facilitate the uninhibited passage of connected cables. The clever design also permits the fitting of a heat-sink on the processor if required. An added bonus is the naming of the ports and connectors.