The perfect workbench for any garage or shop! It is inexpensive and easy to build, has a 2 ft extension for added work space and it has casters allowing it to be tucked away when it's not in use. It also has a tons of room to store all of your tools! Roll it around with you while you work, lock in to place and roll in back against the wall when you are done! Free plans at www.shanty-2-chic.com
If the over hang (part of section A) extended the length of the table and then both lower sections and upper sections could be enclosed to hide wiring and minimize fluorescent light into classroom - this would work.