These are essentially low walls, so a figure standing behind one of these stacks should benefit from medium cover (+2 difficulty).
All of these stacks are scratch built from soda straws. I don't ever use straws, but they keep giving them to me at the drive-thru. At least this way I get to recycle some of them.
This is a simple and fast project for getting some high-tech terrain on the table. Take a few straws of equal diameter and cut 6 or 7 pieces of identical length. Begin stacking the pieces, smearing a thin line of white glue down the length of each piece. You can build a stack on top of a flat piece of plastic, or on top of a little pallet made from bits of plastic sprue. Stacks also can be bundled with string, wire, or thin plastic strips painted to look like metal cable or banding. All of these techniques are shown above, and the end views of the same pipes are shown below.
I chose to paint some pipes grey with small red or black stripes, to match the appearance of my high-tech machines. Most others are painted black and drybrushed with silver or gunmetal to produce the look of either shiny new stainless or grimy, oily iron. One stack I painted light blue, inspired by modern sewer pipes but consistent with the occasional appearance of primary colors amidst the grey and white on Star Wars sets. The pallets are painted black or dark metallic. I wrote letters or words in the Star Wars "Aurebesh" characters on only a few pipes, using a fine-tip Sharpie permanent marker.

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