[Closed] FF29 and other 650b+ bikes fork length

Just looking again at the ff29 chubby which I've been awaiting a review on from stw towers.... Ahem, please?! 😉

See upgrade are now listing build kits for the frame, but they're listing the forks as 160mm 34's.

Am I having a bit of a moment here or is that correct? Given the frame was designed around 120mm would putting 160's on not knacker the geometry and possibly lose the warranty? I thought 650b+ ends up at a similar diameter to 29" so I can't see there being much a/c height to make up, but also they're listing 650b forks for it - surely b+ won't even fit?