Honestly you can probably go with 6 PAs, I don’t think the thermal vent is necessary as long as you stagger fire them in two groups and and engineer them in a way that doesn’t increase heat.
Gimbals are a hard sell for me at all, frags probably being the only exception because you’ll try to be close and centered before firing.
The only hardpoint that has good FOV is the single top large, so if you felt you had to use a beam, use that slot. But, the top 3 hardpoints have the best convergence, so it’s a tradeoff to do this.
That has to be a norm joke