How do I make a window frame?

Here is a picture of an old window with sash weights. You could make a frame and buy the pulleys. https://www.oldhouseonline.com/repairs-and-how-to/replace-broken-sash-cord

I have a house full of double sash, weight propelled windows and I suggest you look at such a window and replicate that for your wall, but why you want to do the rigamole with sash cords and heavy weights for a display that could be handled by some sort of a pole or such, I don't understand

Windows are fairly complicated to make,from scratch. Look at you tube videos,on how to make a window with weights.

Clean your DIY window frame by these steps:

Use a soft, dry brush to get rid of loose dirt.

Wash the frame down with a mild detergent water, and a soft cloth.

Don’t use too much water - soaking your wood will cause it to rot.

Use a toothbrush for any hard to reach areas.

Go to your local Habitat for Humanity store and find one a little larger than you need, then take it apart and cut it to fit. Glue all the joints, give it a good sanding, and finish off with your glass and moldings around the glass.