Docking, not necessarily. Laptops have ports all over the place: on the left, on the right, on the back, and sometimes even on the front (like the 3.5mm jack for headphones).
You could probably use only one USB port on the laptop and integrate a hub into the case. But for ethernet, audio, and HDMI, you'd probably need cables. The nice thing about cables in the box is that adapters could be used. If a laptop comes with VGA out only, that can be adapted to HDMI. If there are separate audio out and in jacks, those can be combined with an adapter. If there is no ethernet jack, it could be added with a USB network card. There are also adapters for laptop power supply cables for the C13/C14 three-pin interface.
So a lot of work can be done inside the case by the person building a desktop/console/server out of a laptop. But no one is selling a universal case with a backplate. And desktop cases are difficult to work with because they expect a backplate from a motherboard.
Really, the product could be just an I/O backplate that mounts to standard ATX stand-offs/screws and takes extension cables, plus something to regulate fan speeds by temperature that also has fan headers. The power button might be a challenge for the builder to solve, but with very minor soldering, most power buttons integrated in any case would work.
Instead of a case, I have a couple old laptops which broken screens but everything else is okay. Could I not just detach the screen (hinge and all) and just have the base case with the default laptop keyboard? Then just plug in a hdmi cable in the port and use that as my new screen?
In this case, there would be no need for a universal case because I'm repurposing everything in the laptop "as is" except the screen.
You could probably use only one USB port on the laptop and integrate a hub into the case. But for ethernet, audio, and HDMI, you'd probably need cables. The nice thing about cables in the box is that adapters could be used. If a laptop comes with VGA out only, that can be adapted to HDMI. If there are separate audio out and in jacks, those can be combined with an adapter. If there is no ethernet jack, it could be added with a USB network card. There are also adapters for laptop power supply cables for the C13/C14 three-pin interface.
So a lot of work can be done inside the case by the person building a desktop/console/server out of a laptop. But no one is selling a universal case with a backplate. And desktop cases are difficult to work with because they expect a backplate from a motherboard.
Really, the product could be just an I/O backplate that mounts to standard ATX stand-offs/screws and takes extension cables, plus something to regulate fan speeds by temperature that also has fan headers. The power button might be a challenge for the builder to solve, but with very minor soldering, most power buttons integrated in any case would work.