The Amish make extremely good quality and completely customizable furniture. All of their catalog items can be modified because each one is made to order. And the prices are quite reasonable considering what you get,: hardwood, proper dovetail, mortise and tenon joinery, custom stain and finish, etc.

This is one such company I'm familiar with but there are others: https://bhfurnitureanddesign.com/ it's funny how modern their website looks considering the folks that sell them.