A few photos might give you a hint as to what it will be.
1. A handful of red gum slats
![Image](http://uploads.tapatalk-cdn.com/20190720/836016495a5b49b8f936ab9924d0228c.jpg)
Chose a couple and cut to length/width
![Image](http://uploads.tapatalk-cdn.com/20190720/3472b4f8acaa8991cbf3f204e15c5789.jpg)
Made up a 20mm grid and laminated it
![Image](http://uploads.tapatalk-cdn.com/20190720/6576a29a135313612c8c057748acb74a.jpg)
Stuck down and ready to punch marker points
![Image](http://uploads.tapatalk-cdn.com/20190720/424319657143b0cd41350cfb4078e339.jpg)
Punching finished and voila, a 2cm grid on my timber
![Image](http://uploads.tapatalk-cdn.com/20190720/f40126e93c51a6b652019fce7b837aaf.jpg)
Gotta have a supervisor
![Image](http://uploads.tapatalk-cdn.com/20190720/1d793cc7d4547f29a51d12be5bcb7626.jpg)
I hope it works out
![Image](http://emoji.tapatalk-cdn.com/emoji16.png)