Modding SW3?

[Nanaki]

Question: Is it possible to add more guns/missiles to existing ones? For example the wyvern_mk1 or dragon with 4 guns, 2 sys and 2 missiles.

You can add small guns and systems to no ill effect, just as long as you use valid slot IDs. For small guns you will likely have to assign multiple small guns to a single small gun hardpoint, not a big deal, I think.

Adding missiles, big guns, and turrets requires editing the model, as you need to add additional hardpoints for the physical attachments. You can technically assign two weapons to a single hardpoint like small guns, but it would look really, really ugly (two weapons overlapping eachother). So it is a 'Do at your own risk' thing.