u/AntiqueSqueak

I'm building a walk in closet and I want to install an angled mirror here(first pic, in red). I'm looking for ideas on how to do that.

my initial thought was to get a big sheet of plywood, cut to size, and screw it into the door jam and the wood around the window frame. and mount the mirror to that. but im looking for other ideas or thoughts on what I was thinking.

The second and third pic is the work in progress at hand.

I don't have a mirror yet so I'm open to any ideas.