Ben Heck's PS3 Slim Laptop
We've occasionally discussed Ben Heckendorn's various console modifications, and he's now come out with a new one: a laptop version of the PS3 Slim. It has volume control buttons for the built-in speakers, and plenty of vents for cooling. The display is a 17" widescreen panel, and the Slim's hardware doesn't fill that much space in the case, so there's a neat little compartment for the power cord. Ben's blog post shows details of the laptop's construction.
We called those luggables back in the days.
I don't know how long it would take to saturate the market, as it seems like sort of a small one; but given the prices that crazy fanboys will pay to have perfectly stock consoles a few days ahead of time, he might well be able to pull that by catering to a few well-heeled fanatics.
However, while the market might be there, I suspect that, once tapped, he couldn't hold out for long. 1 guy, using more or less standard home modding methods(albeit applied with competence substantially above average), doing bespoke pieces would have a hard time competing with a smallish pro outfit doing larger runs at somewhat lower prices, with the benefit of actual machine tools, and parts you can only (cheaply) buy in lots of 100, and possibly rework kit above the level of a soldering iron and strong nerves.
I would agree with you that it would be difficult to make good money on this as a career move, but he could possibly make a decent amount of extra income (on top of his day job) through doing custom jobs. He would have to charge above the odds to make each individual job it worth his while, but as he would be serving a small niche this wouldn't be unreasonable.
Of course he may be of the attitude that he does not want to take money for this, as it is his hobby and he might not want his hobby to become a chore (even if it is a chore that earns him money).
Because real laptops cannot possibly run games.
I must be getting old.