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.
2x4 Shelving the best way to fit 2x4 at corner, screw, wood, shelf, end, no glue
Build a simple, strong workbench made entirely from 2x4s. It's inexpensive (less than $100) and takes only about four hours to build.
In My Garden
outdoor dining with covered patio.
The Laurent-Perrier Garden
Pea gravel garden path
A bridge over a stream, even a dry one with rocks, gives a focal point to your garden & a bit of romance too..