I would love to see some pictures of what you're describing. I'm having trouble picturing it.

Greenhouser: Until I replace my digital camera, I'll have to try to paint a verbal picture.

Think of the vertical aluminum supports, (or polybars) in a GH as wall studs, except there is nothing between them but sheets of polycarbonate.

Ergo, the only surface to which you can attach anything on the walls are the polybars, and to do that, presuming they have the usual channels; you need hex or T bolts.

But your "wall" surface is still only a few inches wide, and each 2 inch wide bit of it, is about 2 ft. apart.

So- you lay a board across them horizontally, attaching it to the polybars, and the result is a solid "wall" as wide as you want it and as high, top to bottom, as the width of the board.

As I will be using one entire side of my GH for fish tanks, and it's a bit over 16 ft. long, we used 2- 8 ft. boards. It presents enough solid surface to give me space to attach water and air lines, and hang some bits and pieces of small items on it, yet doesn't present so much of a solid, opaque area as to affect the light coming into the GH.

The boards are, as I have already described them, just standard sized 1 X 6's, but solid vinyl instead of wood.

Does that help?