Sounds like quite a task. Sounds like he'll need engineers and programmers.
He can buy all the necessary chips but... then there's the process of arranging them inside the console, hooking and soldering(making a case for the console). Then there needs to be code that runs the games for the console.
It sounds like a heck of a lot of work. I'm no expert but I have doubts in how plausible his goal is.