Roll off in the closed position. South end wall, that will use a roll up type door, is not shown. 5'x5' isolated concrete slab can be seen just below the telescope. It is 50" deep. The telescope is not drawn to design spec but is a reasonable estimate.   The rails can be seen on either side of the main arch. They run 48' in length, use 2" diameter tubing and ride atop brackets that hold them into a concrete knee wall. Green around the enclosure represents grass while the light blue represents a reflective material used to reduce heat build up immediately surrounding the enclosure. This might be white, crushed stone or the like.