Dbrand did the thing: it announced a Portal Companion Cube skin for Valve's boxy new Steam Machine, allowing you to turn the new PC / console hybrid into a facsimile of gaming's most loyal sidekick. The Companion Cube skin is limited edition, and will release some time in 2026, though we don't know if it will launch alongside the Steam Machine itself, which is targeting early 2026.
If you're trying to make a PC that has similar features and similar performance, I think the Steam Machine is going to be a really competitive price to that and provide really good value to it,