an embodiment of the invention the top and bottom track shown in fig7 is similar to the top and bottom tracks discussed above but the track shown in fig7 does not include any formations for locking the panels into the track and does not include any deadwood ledges fig9 shows corner caps in accordance with an embodiment of the invention corner caps may be used essentially as top and bottom tracks at corners fig1 shows a side elevation view and a perspective view of an interior top track in accordance with an embodiment of the invention the interior top track shown in fig1 is similar to the interior top track discussed above but the interior top track shown in fig1 does not include any formations for locking the panels into the track fig1 shows a side elevation view and a perspective view of an exterior top track in accordance with an embodiment of the invention the exterior top track shown in fig1 is similar to the exterior top track discussed above but the exterior top track shown in fig1 does not include any formations for locking the panels into the track fig1 shows a door box header that may be formed in accordance with an embodiment of the invention the box header provides added structural support for window and door openings similarly fig1 16 show additional types of door and window headers that may be formed in accordance with various embodiments of the invention the system components e g construction panels top and.