The primary mirror cell and ground boards were cut from a piece of HDPE from AGC catering equipment, which was sold as a chopping board. It was probably 5 times cheaper that way rather than getting a sheet from a plastic engineering company. Just for reference I bought a sheet 450mm X 600mm X 13mm but it came as 456mm X 607mm X 11mm. I cut it with the jigsaw and a guide to give me straight cuts. I'd appreciate feedback and questions.
https://www.agcequipment.com.au/kitc...ories/?pgnum=2