This is never happening, the Ultra needs a giant copper heatsink.

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.

I wonder if the MacBook Pro can handle the thermal envelope of actually running an Ultra flat out.

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.

Post-Jobs Apple is willing to do some things he’d not allow but I can’t see them selling such a beast.