Ah, in the case of the Aura they specifically say not to use plywood with an MDF core. The Proofgrade light plywood has a wood core. It’s definitely possible to find non-MDF plywood from other suppliers. Baltic Birch (not plain birch) doesn’t have an MDF core so that should work just fine in the Aura. I get mine from GS2Awards
You’ll likely have to pick up your own masking, which can be bought in small amounts from places like Amazon, or in bulk from suppliers.
There are a lot of helpful answers in this post, it’s worth a read-through!