Enthusiast under the pseudonym thegarbz created a device called The Nuclear Football. This is a full gaming PC in a custom case with a liquid cooling system and a built-in 23-inch monitor. It is argued that the system was cheaper than a laptop with similar characteristics.
The computer is built on a desktop CPU AMD Ryzen 5 2600 and motherboard B450-i Aorus Pro WiFihas a graphics card NVIDIA Geforce RTX 2070 Super FE, 16 GB RAM, SSD 256 GB, power supply 600W and the case from the tool case. Lacking only the battery and keyboard.
Of course, the novelty can be considered only partially portable, but for those who want a powerful portable system, such a solution may be approached. And screens at the airport do not have to borrow.