You might have to invest in a router, some ogee bits, and a lot of practice boards. It's sort of fun!

Or, since you'll be painting, you can look for small molding pieces to stick onto a piece of flat stock, mitering and filling your joints.

That window stool and apron both appear to be custom made. Neither look particularly complex however. As mentioned above a couple pieces of lumber a lumberyard, a router with bits and a table saw you should be good to go.

Yep. Gonna have to likely make some of your own.

One more vote for custom made. You can find a router fairly cheap if its a tool that you'll rarely use.... Might not break the bank to have someone make it for you though either. Finish carpenter, cabinet shop, etc.