Here's chatgpt's take on it:

Just a variation of the same idea:

Have to admit that the AI schemes look pretty good even though it introduces yet more wood tones. The newly introduced wood tone of the furnishing do seem to go rather well. The addition of the rug lessens the overall impact of the wood. I do find the vertical striping of the various wood tones of the bed wall a bit distracting. Might suggest that be toned down a bit.

Get me some paint!!!! Keep the beams and the flooring...and kiss the rest goodbye.

Furnish it first and then if the paneling is too distracting you can always go back and paint it. I think it can be a neat feature in your room so I’d try to use it before painting, because once you paint it there’s no going back- at least not without a lot of money!!

With that much wood, I’d avoid trying to find a third exact match. Keep the built-in as the main mid-century moment, then bring in one quieter material for the biggest new piece, like an upholstered bed or a simple painted dresser, and use a rug to break up the floor-to-wall grain. If you add wood, choose a finish that contrasts clearly and repeat it once, rather than collecting several almost-matches. You can live with the paneling before painting it.

I think as long as any wooden furniture matches one of the many tones in your panelling --- not tough --- you'll be fine. Just avoid all ash, birch and other light-colored furniture.

What a room! With wood on the walls, ceiling and floor, I'd make the furniture the quiet layer instead of adding yet another wood tone. Think an upholstered bed in oatmeal or olive boucle, and nightstands that either match your darkest wood exactly or skip wood altogether (painted, lacquered or cane).

A large wool rug in cream or rust will break up the floor so it doesn't run straight into the paneling. Then add contrast with black or brass: a pair of mid-century sconces, a globe pendant, a black metal lamp. Bedding in mustard, rust or teal keeps the period feel without looking themed.

If you ever want a full layout and shopping list for it, that's the kind of plan I put together for people online.

What a room — I'd be slow to paint any of that paneling, and not just for the look. Original mid-century woodwork like that is one of the things buyers actually notice and pay for, and once it's painted there's no going back to it. I'd let the panel wall be the pattern in the room and keep everything else quiet and solid — plain oatmeal or olive bedding, no busy print, so the grain isn't competing with the textiles. And choose a low headboard, upholstered, rather than a tall wooden one: a tall headboard will just hide the best wall in the room, and a low one lets the paneling do the work. Live in it furnished for a few months before you decide about painting — I think the room will feel very different once there's a big rug and soft furniture in it.