Snowflake 300 - 260 x 260mm and holds 30 x 12mm Bullet pixels.
This is laser cut from 15mm XPS foam board sandwiched between 2 x sheets of 3mm corflute (White / Black)

Link to XLights model:

https://drive.google.com/file/d/1MNTIf5tRukG6A3jOYrhbDrTieN-fWWMC/view?usp=drive_link