C.R. Laurence window trim options?

[Truen]

I've got a couple windows roughed in and I'm looking for interior trim moulding pieces for this C.R. Laurence Window

I will be covering with upholstery to match the walls. Any leads are helpful. Thanks!

Photo below for context:

 

[Choff]

Glue some wood blocking around the window and glue or screw to your wood on the sides and then use the same wood panel and make cut strips to go around window , and glue and roll your material to window, save you some ching!!