I built this independently as well (easy since it's a straight swap for the lasers) I also messed around with this And this
Why not keep the lasers and machine guns? Assuming you aren't firing the PPC's haphazardly and can control your heat. It's fairly effective in my opinion.
TCMK3 Version. PPCs should really be on the same arm for convergence issues; especially given how wide the nova is. That lets you take the B arm for some bonus quirks.
The missing lower-arm actuators was making this build a chore to use. I recommend moving the PPCs to one arm and putting the lasers (w/ a prime omnipod) in the other.