shower panels

Quite handy with tools and plumbing, but racking my brain for ideas to change this into a shower room please, window needs to stay also, what's your ideas?

Hi I am thinking of getting some shower panels or wetwalls for my bathroom.There are some lovely ones these days. Has anyone any experience with these? There are UPVC based ones (ipsl) and some laminated wood types (multipanel,selkie,etc). Both are popular from what I understand. Wood based...