Print out the drawing of your wood layer from you 3D Onshape file

Use stick glue to attach the template to your wood layer

Using the drill and a 7mm drill bit, drill a hole at each corner point of the wood layer

This is what the wood layer should look like after drilling

Put the blade of a coping saw through the holes so that you can cut the cavity out

Make sure you keep the Coping saw level

It is possible with some thinner sections of wood to use a scroll saw in the same way

When you have cut between all the dots, you should be able to remove the middle part of the cavity. Your teacher will keep this material

Use a coping saw to cut on the outside of your template, following the shape. Keep the coping saw level front and back

Try and cut small pieces away at a time, DO NOT try and cut the shape in one go

Once you have finished cutting, use a file to perfect your shape