I have no idea why builders do what they do. What purpose does the niche fill? It collects dust, adds nothing to the design of the room. I would have it dry walled then frame the doorway with the same white trim as the others. Also suggest you paint the ceiling one color.

Sweet doggy. :) A few suggestions ... not necessarily these exact ones, as I don’t know budget and sizes needed, but just to show as ideas for you to search: Live edge tables — https://www.wayfair.com/furniture/pdp/union-rustic-mazelina-coffee-table-w001115136.html https://www.wayfair.com/furniture/pdp/foundry-select-nauvoo-coffee-table-w000897820.html https://www.wayfair.com/furniture/pdp/union-rustic-tindle-coffee-table-unrt1302.html . Woven styles — https://www.jossandmain.com/furniture/pdp/venetta-coffee-table-j000338554.html?piid=195560686 . A bit of an MCM feel, this comes in three color choices — https://www.wayfair.com/furniture/pdp/masaya-co-manzanillo-coffee-table-ndac1009.html?piid= . This might feel too clunky, but love it with boho: https://www.westelm.com/products/carved-wood-coffee-table-g414/?pkey=ccoffee-tables&isx=0.0.6529 . Tiered: https://www.worldmarket.com/product/wood+and+metal+multi+level+coffee+table.do?sortby=ourPicks&from=fn . One more: https://www.wayfair.com/furniture/pdp/mercer41-enzo-frame-coffee-table-w001418525.html?piid=

Maybe you can add a bit of color with the accent chair, as you have plants adding a dark green or blue would help to animate the room and create a focal point. Also, are you thinking of adding a coffee table? It is the remaining element that is missed in your current design. I would suggest adding something neutral like a Barcelona table. I'll attach some ideas :)

I really like the cabinet hardware you proposed. The table is lovely, but are you sure you want more wood in the space? You well may (I would already be at my threshold with what you have already), but it can get tricky balancing multiple stains and colors of wood in the same space. I would want something to provide some counterpoint to the wood, but that's me. The ceiling fan is fine. For the light fixture, I don't care for clear shades in general (though I know they are very popular), and the shape seems more industrial than country/rustic. The rug is about as far from country/rustic as I think you can get. Other than color, I don't see anything about it that suits the space, Braided rugs always seem to me to be the most "country" choice. A natural fiber (jute or sisal, though not if this is for the dining area) would suit the space. And I don't think you could go wrong with a traditional style.