Ditch the Aluminium and go with a copper MacBook Pro. Or silver. If you get it with a terabyte of RAM, the silver shell will be a small part of the total costs.

Argentium 960 would most likely be the best alloy for the job, as it’s a good heat conductor and doesn’t tarnish like pure silver.

There are gaming laptops that come with power bricks rated for higher output than a Mac Studio's power supply. M3 Ultra levels of power dissipation are possible to handle in a laptop, but it wouldn't look much like a MacBook Pro. That kind of gaming laptop typically has four fans (compared to two on a MacBook Pro), and large vents on the sides, bottom, and back of the machine allowing them to move a lot more air through the system.