I have started the interior . I have different types of wainscoting. The skinny ridge wainscoting is cardboard with one layer stripped off to reveal the ridges. The finish above the mantle is plaster that I sculpted with a exacto knife to look like a wider plank wainscoting. I did the same on the back wall and the wall with 3 windows.
I started the wood floor. And gave everything its first coat of white.
This ceiling is done with the hot glue gun following a simple pattern to get a tin tile effect. I'll add a little silver later on.