Ok so this question is regarding my Design and Technology GCSE, I have 5 pieces of 15mm thick plywood. These pieces of plywood have no middle and need to join together to make a sort of box with another piece of plywood that is 3mm thick on the bottom. I was thinking about just using wood glue to glue every piece together or would it be more durable if I drilled holes, through all the pieces, countersunk at the top and used screws instead or is there another way entirely for example biscuit joints.I'm limited to, while it is still very well equipped, a school workshop.
Glue and clamp to laminate the plywood together. Just be careful to make sure all the pieces are all well aligned and clamped evenly - use additional wood top and bottom to spread the clamping force evenly and avoid damaging the plywood. Also be mindful that the glue will be squeezed out of the joints so will need to be carefully cleaned off before it dries.