4-bar hinge and 5-bar hinge will be more stable.
But the making such a mechanism seems difficult. So I chose the 3-bar hinge.
Bars 1 and 2 must always form an isosceles triangle. For example, when the bar 1 increases by 30, the bar 2 becomes (-)60, and when the bar 1 increases by 60, the bar 2 becomes (-)120. The sum of the three angles is 180 degrees. So, Bar 1 and bar 2 joing with bar 3 at the same angle. The arithmetic I learned in elementary school helped me just now. But not all 3-bar hinges are. This way is easy for rigging with Poser.
This is able to fold up properly.

I lined up a lot of this.

The top and bottom are paired.

Of course these are for opening and closing windows.

A bay window is. This is not very elegant. But Iām generally satisfy with this.

As usual this is too big for Pranx. But may be a little small for La Femme. I tend to forget that she is about 5.9 feet tall.

mininessie
oh! great idea!
Well , we always can scale Pranx to use all the items comfy.^^
elleque
Thank you š But, this may become big more š
Mel Whittaker
I think the big window next to Pranx is just perfect, I can see him curling up in the window to star gaze or read a book. š
elleque
It’s romantic š
Mel Whittaker
Very much š
Jan Freeman
You will find a LOT of products do not include the hardware on doors and windows. Thank you so much for going to so much work!! It makes it so much more realistic!!!
elleque
I’m happy you like them š I like such hardwares. But they may be patented and cannot be easily imitated.