Pffft, Amateurs!
They ought to do it like the big boys do:
Study finance and business management in college.
Then get hired as a bank manager.
Work your way as high as possible through schmoozing, ass kissing and double dealing.
Then once in position, use every legal/quasi legal/illegal trick to pump them suckers dry for billions!
True, it might take 30 to 40 years to get to the point where you can pull off the heist, but if you're not caught until that point, Instead of being arrested, you'll be given billions more to keep your hosts alive while you keep draining them!*
*Caveat: Does not apply to Iceland banks. There, you *will* be jailed when caught, and the people you robbed bailed out!
(What is wrong with their Government?)