Big_Bill

Had a similar problem, I used vinyl trim + molding all around- pic of the end result:

MissWrite

That looks really nice.

joecaption

I see you found out why wood floors in a bathroom is not such a great idea by the staining of the wood near the shower and having to cut out the floor around the toilet and replace it.
Looks like you added a bunch of layers of poly trying to seal it from water.
I would have just removed the window and added a solar tube and been able to light up the whole room with out the chance of a leak at the seams in a window.

Big_Bill

Nope. What you see is what I had to dig through 2 layers of carpet & 2 layers of vinyl to get to, 100+ year old wood flooring. The toilet was already on the slab. As to boarding it up, it's on the 3rd floor with no outside access. Here's a secret, the shower curtain rod is CPVC electrical conduit painted metalic silver.

joecaption

I've removed the window and added a vinyl casment window with vinyl jams and casing, at the top (that way I could use the old header) and just reframed the lower part and added insulation and redid the siding and wall inside, still had the light coming in and none of the leaking or rot to worry about.