How to fit 12t of cargo into Sidewinder MkI?
The Sidewinder MkI actually has a maximum cargo capacity of 16T foregoing shields, but you can achieve a 12T cargo capacity by equipping one 2E cargo rack, four 1E cargo racks, and a class 2 shield generator like so. You can then gain an additional 4T of capacity by replacing the shield generator with a cargo rack, but the better option by far would be to play it safe in the Sidewinder and save up for a Hauler.