I did an incredible engineer weapon mod yesterday.
I went to the Dweller and did a new grade 3 efficient beam laser mod with thermal vent special effect. I have my corvette fitted with 7 beam lasers (5x turreted C3, 2xC2, 2xC1 and 2x gimballed C4).
I can now fire all day long without getting hot!!! Only the capacitor put an end.
Look at this video of another cmd:
I went to a resource extraction side for testing and ended with 3.8mil CR no scratch in the hull and 2000CR reloading costs (only chaff launcher, heat thinks and shield cell banks).