Quote:
Originally Posted by bf-110
No,wait,you mean plane“s own fuel tank,not the additional fuel tanks. 
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Yes. However, it's not the first with that feature. The Polish PWS-10 also had a drop-able main fuel tank.
Who originally came up with the idea is anyone's guess.
As for the wing guns, it would seem like a relatively easy addition - delete the barrels, flatten the blisters, adjust the skin to reflect the changes (I'm sure the blisters use "lighting" illusion enhancement) and modify the weight/balance of the guns and ammo (I don't know any details there).