Wall panelling - continue in a small space in a corner or not?

[PinkCamelias]

I have a room which has been divided in two and the new wall needs to be finished with a chair rail and moulding made to match the original one. There will be a wardrobe on a wall on the left (the new wall), so there will not be any finishing behind it, but I don't know what to do about the corner of that wall with the window wall? The wardrobe will end ca. 40 cm before the corner. The old panelling on the window wall will be finished - the square will be closed; now it is a part of a bigger element which is cut by the new wall, and new panelling will be added under the window (it's a support for a secondary window that will be put in the recess).
Shall I add these 40 cm of a chair railing and a small square panel also in the corner next to the wardrobe? It will be barely visible, because there will be a curtain hanging there, and the wardrobe will be 60 cm deep (same as the width of the wall before the window) but still I think I should add it? For context, the panelling elsewhere looks like on the second picture, and the room is ca. 3,5 m high.

I'm assuming it goes around other walls in the room and not just under the window? In which case I think you do need it, to finish it off properly. If it's only on the window wall, then you don't.

Yes, it goes around the room. I also think it is necessary.

And another question, although I think I have decided, but it's always good to ask :) The same new wall needs to be finished on its other side too, in the other room. Should the panelling on that wall be symmetrical with the opposite, finished wall, or should it be symmetrical on its own? The finished wall is the one in my post above.
The new wall is shorter than the opposite wall, because there is a door at one end. If I want symmetry with the opposite wall, I have panels of 50 cm, 150 cm, 50, and then there is space for ca. 70 cm panel, since the door does not allow the placement of another 150 cm. I think it looks awkward, and it would be better to treat this wall as a separate unit, and put three panels of 60, 180, 60. Spacing between the panels would be the same on both walls.
There are also longer and shorter panels in the room (eg. longer one under the window, shorter in the corner etc.) which makes me think that it is not necessary to have them all the same, but rather how proportionale they are with the wall. Am I right?

I would take the opportunity to get rid of all the panelling. It's going to look horrendously dated in just a few years. But if you insist on keeping it, I certainly wouldn't faff around putting up 40cm of wood in a corner.

I don't think it will, it is original from 1908 and there's more of it in the house. We are not putting any new panelling, just finishing the new dividing wall.

I think you need to do it everywhere, including behind the wardrobe. You won't ever be able to move the wardrobe otherwise.

which makes me think that it is not necessary to have them all the same, but rather how proportionale they are with the wall.

I think this too.

Thank you @SoupDragon !

We won't do it behind the wardrobe, though, it will be 3 m long so it won't be moved anywhere :) It will be fnished itself with moulding so it should look fine.

It's so difficult to judge proportions before taking the plunge! If it were me I'd mock up different options with masking tape and sheets of paper, photograph them all then sit and decide over a cup of tea...sort of "measure twice, cut once" approach.

Your house is lovely. Don't take off the panelling!

Yes I know @TeaAndStrumpets ! The builder surprised me with this question yesterday, I had no idea they are doing it at this very moment (they are incredibly fast). I initially said to make it symmetrical with the opposite wall, but then I thought about it the whole evening and made some drawings. This morning I called and asked them to wait, otherwise they'd start cutting already. I will go there now and make this mock ups with them on the wall, but I don't think they will give me more time (I'll try to negotiate...).

And thank you for the compliment, it is indeed a lovely house :)

Panelling won’t date if it’s in house of the right age! Just like cornicing, ceiling roses, mantel pieces etc

Save the panelling! (As another with it in the hall and downstairs predating way way before it became trendy again - I won't take ours off as it really does protect the walls from kids bashing along with schoolbags etc)

It will annoy you if it's not done properly.

Sounds like a decision May already have been made, but I would agree with symmetry along the wall rather than opposite.

Once you have furniture in place, you're very unlikely to see the opposite walls at the same time.

Yes, @MaggieFS , I think I have decided! I put tape on the wall and tested various options, and I've made this wonderful diagram (on a baking sheet, as it's the only big sheet I have where I can draw and keep the scale :) ). I think I will go with the first option - 75 cm, 170 cm and 75 cm, with 7 cm spacing (spacing is the same as the opposite wall).
The second option is 65/190/65, so technically more proportianal with regard to the opposite wall, but the middle panel looks too long.
Option three is the symmetry with the opposite wall, it does not look ok.

That window reminds me of the front screen picture of the Last of Us.

Hopefully you will not all turn into zombies.