Specifically, I need:
- A businessman, who will keep track of orders, outsourcing production, making bulletpoins, etc.
- An electrical engineer, who can design a PCB with the needed components.
- A programmer, who can help me in making the PC UI, the µc firmware, auditing etc.
Why do they need you?
Heh

By the way, this is about the fiftieth time this idea has been posted. But at least there's a nice drawing this time. Maybe someday somebody will actually sell these things, but if they were marketed as a way to store your BTC I'm not sure I'd trust them.
In the meantime you can buy a USB stick with an AVR, flash memory, and two buttons on it for about $10. That's probably the easier route, and since they're sold mainly for non-bitcoin applications you don't have to worry quite as much about being trojaned.