Steam Brick: A DIY cut-down Steam Deck, sans input and screen
Steam Brick: A DIY cut-down Steam Deck, sans input and screen

GitHub - crastinator-pro/steam-brick: Modifying the Steam Deck into a compact, mobile, AR gaming device. Not endorsed or supported by Valve and is likely to brick your device...

Is it not much easier and cheaper to buy a mini pc and run Steam with an OS of choice? (You can chose between any number of Linux distros, I use Arch btw). Steam can just launch on boot into big picture mode, it's pretty much a console at that point.
Mini PCs usually don't have a battery. The use case for this conversion is on the go with AR glasses.
I think it would be hard to find a NUC that costs the same or less and still performs the same as the Steam Deck. You could maybe get there with a custom-built SFFPC, but it would be tricky.
I'm not sure what a Steam deck costs? $450 - $550?
A Minisforum UM870 with 32GB of memory and 1TB SSD is around $500. That has an AMD Ryzen 7 8745H CPU. 8 cores 16 thread 4.9ghz boost Zen4. Gpu builtin Radeon 780M with 12 RDNA3 2.7ghz cores. That could give the Steam Deck a round for it's money I think.