Material:
3 layers of 1.5mm Bendy Ply
After the template was cut, first layer of plywood was bent using heat gun (which surprisingly easy), then before the second layer of plywood glued and clamped on to the first layer, it was cut into 4 parts to give more strength.
Then, the last layer was glued on to the second layer and later trimmed off.
Back rest template was cut using jigsaw (not very good idea) and cutter knife (better, but it took longer).
