Photos of the situation: https://imgur.com/a/gMoHzT2

I just bought a house and the bathroom sucks. There’s an ugly yellow shower wall panel, the floor is a non-adhered piece of vinyl above an ugly linoleum, and the sink looks straight out of a trailer. I wanna redo everything. I don’t wanna mess with tiles however. Any way I can get another acrylic surround thing, remove that wood trim around the window, and keep the window, while managing water adequately? I’m not exactly sure how I’d do that without removing the window and flashing it. I’ve heard caulk or silicone is a passive solution that doesn’t last.