On Jun 16, 1:38*am, "iwdplz" wrote:
you could take a bubble level and draw some short lines. *Make several of
these along the entire length (like a dashed line). *Then use any straight
edge to extend the dashes to the full 27' so the full line is parallel to
all of them. *You might be able to use the top edge of the panel as a
vertical guide..

For 27' feet? You won't even be close at the end.

Harry K