Hi Josie this is a quick reaction as havent had much time to think,, but for starters the wall next to one with poster on needs using as you say and although corner design sounds good , Im wondering if you would get more out of that space by going floor to ceiling with a fitted unit flat against that wall , not very deep say at a guess without being there,,400mm deep by say 600 wide ,,,(I know you have to access the bed so maybe this wont work but...) ... and leaving an open box shelf within this tall unit for Tv .The rest being cupboards with touch close doors for max storage and no handles.. You could colour block that open bit by painting say soft grey as a feature. That feature could be repeated in a bookshelf elsewhere for example ( We have aspbergers in wider family and understand a little about reducing anxiety from viusual overload.) You could get the makings of that unit in Ikea. otherwise custombuild. Im sure you dont want to rethink your bed purchase but combination storage beds are so varied now ,, finding the right one could be a real investment in the circumstances. Things like ladder position, desk position and clothes storage, will all make a lot of difference as you are well aware already. If your son helps choose it would ensure he feels at home with it. Just make sure your measurements are spot on if you are looking . I can see a few mm could be crucial if it doesnt fit. Im finding it hard to make out the real position of the end of the bed and the "jutting out " bit of wall, A rough floor plan with measurements in cm or mm would help . Having worked in kitchen and bedroom design I must say you do have a challenge here josiewosie woo1,,sorry nearly forgot the woo... But theres always a solution !! Apologies this is a not more comprehensive an answer but do see your dilemma here and the reason why you need throw it around. Your ideal answer is really a good local,' design concious' carpenter/handyman who would refit room from scratch. ( I do have one at home but unfortunately hes not available right now Sorry....) All the best with your plans.

Hi, I think I’d still look for a tv unit or low sideboard even if the tv will be wall mounted. Something that’s wider than what you have currently. There is a huge amount of options when it comes to style but here’s a few ideas. You could also look at second hand sites (ebay, gumtree etc.) for a retro style sideboard. They are gaining in price due to the popularity of MCM (mid century modern) but there are still some bargains to be had...plus they have lots of room for toy stashing:)

https://www.wallpaperfromthe70s.com/wallpaper-yukina-light-mint-turquoise?c=58 https://www.wallpaperfromthe70s.com/wallpaper-leonarda-green?c=58 https://www.wallpaperfromthe70s.com/wallpaper-hornus-red?c=58 https://www.wallpaperfromthe70s.com/wallpaper-nirvanus-light-olive-green?c=58 https://www.wallpaperfromthe70s.com/wallpaper-romana-light-grey-beige?c=58 https://www.wallpaperfromthe70s.com/wallpaper-paseo-beige-brown-shimmer?c=58 https://www.grahambrown.com/uk/vintage-deco-diamond-stone-wallpaper/104528-master.html https://www.grahambrown.com/uk/retro-denim-wallpaper/104815-master.html https://www.grahambrown.com/uk/revival-grey-and-rose-gold-wallpaper/105023-master.html Just a 'few' that would look fab!

Pax wardrobes weren't designed for bathrooms so I expect the material may not be suitable for the moist atmosphere in bathrooms. There are tall units available in fitted bathroom ranges, but they tend to be quite narrow. I think a joiner may be a better option in your case.