A matching chair for the learning tower. https://www.designfind.com/project/39063-2-in-1-learning-tower-for-kids
Lasercut the required design files.
You will only need to cut the side and the backrest. The other pieces can be cut with any circular saw.
Use some double sided tape to tape the template to your 18 mm Multiplex. I used the same Grade 1 Oak as the 2 in 1 learning tower.
Next mark out the templates with a pencil on your workpieces and drill some pilot holes to cut the inside rectangles.
Cut all workpieces as close to the pencil line as possible. Both inside and outside edges need to be cut. Use a router to route all the workpieces to the exact size of their template.
Plug the holes with some contrasting wood. I used Wenge plugs as I had them lying around. Flush cut the plugs and sand everything to achieve a perfect finish.
I used some Rubio Monocoat - Cotton white to finish the piece. It's a 2 component finisher. Mix accordingly and simply rub in the oil with a cloth, leave it to rest for 5 minutes and whipe of any excess oil.