Charlie Self wrote:

[snip]

Look for some place that sells 9' plywood. It's available, usually fairly
easily found if you check local lumber dealers, plywood dealers, but don't
expect to find any at HD or Lowe's.

Failing that, build it 8' tall in 2 sections, with a 1' tall center section
with, maybe, a drawer or 2 in it. Might also be a bottom section.

Charlie Self

You can sometimes find 4x10 ply at local outlets. Noticed some at the
orange borg once. Then make them in two sections as Charlie says. This
has the added benefit that you can get close to nine actual feet (you
slide the top part in place, rather than standing the whole thing).
mahalo,
jo4hn