Making your own frames is easy.
We sell bars in two sizes, namely 16″ (406mm) and 20″ (508mm). They are sold in boxes of 20 bars of each size. You will need two sticks of each size to make a frame so a box of 16″ and a box of 20″ will be enough to make 10 16×20 frames.
Initially, you will also need to buy the blue corner kit. You only need one as it is reusable.
The boxes contain the necessary pins. You will have to buy your own glue (standard PVA is fine). You will also need a Stanley knife and a cutting mat to protect your table.
You can buy them here.