I went for two fixed beams below, and one above between two gimbled multi-cannons. The beams overheat so much I may even need experimental cooling upgrades on the cargo modules. 8-o
It's not too bad though. The damage is usually done before the computer lady complains.
...
If engineering I would start with the Beams* Efficient + Thermal Vent is great while you don't miss, if you miss a lot don't use Thermal Vent using Thermal Spread as an experimental elsewhere can help heat wise.How many heatsinks do you have? You might think about having it engineered for extra capacity especially if you use shield cell banks (a must have in my opinion). I never shoot first, you can get fined or have a bounty placed on you (I've spent many-a-night at Oden's Crag).
I never use Shield Cell Banks as either the fight is over before my shields are down or I am too busy fighting to notice until they have gone.
*Actually the first thing I would do would be to get rid of the fixed mounts more time on target and more chance of Thermal Vent not cooking me rather than the target.