I'm not aware of any projects using NSS based builds for ipq40xx. Doubt you'll find any.
I briefly attempted it with Orbi RBR50 from the NSS codebase I used for IPQ806x, but was not successful. The platforms were just too different (internal switch, NSS cores, etc). It's also an aging platform, like ipq806x.
It's either IPQ806x or this thread which is IPQ807x (I believe some folks are trying to get IPQ6018 since it's similar hardware).