By the way, those line drawings show the 410 with 8x 20mm cannon, NOT 6x!!!!
See the small holes are the MGs, then there's two sets right below them, each one for an MG151/20. Then theres the two sticking out of the bottom of the bomb bay, and then there's the two in the ventral gunpod!
I don't care HOW poor it flies with that much weight, I'd try it at least a few times!