Jayme is correct - unless you find a long vertical piece to place next to the bar, I would center it and use the negative space as part of the decoration. Of course add a great mirror or picture above the bar. A carpet in front would warm it up. Looking at the sheen on the wood I suspect this is very polished - you can emphasise the art deco feel by adding lots of silverware (silver tray, cocktail shaker, ice bucket) and crystal glasses - tumblers and highballs in cut glass below a large mirror with a dark wood frame similar to the wood in the bar

How are the house plans coming along? I'd suggest planting trees and making a living wall so you have something beautiful to look out on instead of a 40 ft wall.

Hello, The window looks a little narrow but is placed in a really interesting place . You could go for creating a nice little bay window type here .for this you would need to create a sitting using wooden ply slightly uptil cill level and a foam seat mattress of the size. For dressing the window, roll up curtain could work the best here,I will attach some references.  Further if u wish to decorate it more in Roman style you could opt for a three side frame made around the window opening (On the wall) Shivani Chandra, Architecture Student Alittle

Wooden molding in HDF or Teak wood can easily be nailed directly on walls with headless nails. No need of ply or board at the back. Also don't go for POP moldings as they are not durable.