As the name implies, in the center of the molecule is a Bird Base (or, more precisely, a Blintzed Bird Base), so the acute angles are multiples of 22.5°. A single molecule is easy to fold, but arrangements of multiple molecules are hard to collapse if you use stiff paper. I recommend starting with a 2×2 array of molecules before moving on to larger arrangements.
Many variants of the molecule can be created by flattening the central part which normally sticks up above the tessellation plane and/or modifying the four petals. You can find some examples in the red image. The CP is for the basic variant, visible in the brown images.
Diagrams in IOIO 2016 book
This was one of the models used in International Origami Internet Olympiad (IOIO) 2016, and step-by-step instructions are available in the IOIO 2016 book.
In print media
A CP with additional instructions was published in the Convention Book of 28th International Convention of Origami Deutschland (Erkner 2016).
A CP is available below: