Any advice on first prone board size in volume and length? 70kg intermediate wing foiler. I am also an intermediate level surfer. I have a GL180 gofoil front wing and a 650mm mast. Thanks in advance.

Gong have boards for 630AUD aprox to pre order for december on the link below but they are quite short (too short?). The 4'5 is 39L. Seems very short for a 39L board. Not sure about freight to Aus by the way.
www.gong-galaxy.com/en/product/gong-surf-foil-matata-eps/