Step one: cut the cork tile into manageable strips along black lines.
Next, cut each strip into its individual segment pieces
test them next to each other to form rooms and passages. If they don't sit nicely next to each other, you may need to trim a little off the bottom of the piece, along its edge. Don't trim the top where the paper is glued on.
Here's the segments from the first cork tile all done
now any room, such as this 6x6 square room, can be laid out - with a gap for pit, water, etc, built into it!
Here's a few tiles later
and the finished collection with an unpainted figure to help show scale
when cutting, especially with 1x1's, it's helpful to rest one end of the ruler on an uncut part of a board, so it isn't floating in the air. It helped stop the ruler sliding while cutting.
To cut: run the knife along the ruler's edge, along the black lines of the tiles. Don't push super hard - you can't cut through in one go. Instead, make five to ten strokes with the knife, each time the knife will cut more, and this will stop tiles and rulers from sliding around, and help you to get a good clean cut.
On the final cork tile, part of it was an error - a black line was on the wrong side of one of the 5mm spacing borders. This resulted in me having to find which tiles were too wide, and which were too thin, and to cut the extra 5mm border off the wider ones and superglue them onto the sides of the ones that were cut too short. So far I've only noticed about three squares that had the black line in the wrong position, so keep an eye out for those on the last Cork Tile if you are going to copy my process.
This shows a 2x2 with the extra 5mm border on one side
trimming it off, I glue it onto the 2x1 that is missing it's 5mm border
And here we have it. The first dungeon level tile layout from Descent: Journeys in the Dark, with gaps for pits, rocks, etc, able to be embedded into the room locations!
Now I just have to wait until mid February for the Hirst Arts plaster pieces to arrive, then the glueing, flocking, and painting can begin!