For the cut timber sections, you'll need two pieces each of 711 x 508mm, 711 x 571 and 571x 470mm. I'd suggest you have a chat with a team member in your local store's timber department. Although these are some fairly precise measurements, which would normally be considered outside of our cutting abilities, the team member might be confident in cutting those segments out for you.
I'm keen to assist you further with your project. Please let me know if you have any questions.