JB1

Unless you trust the electrician or have been referred to them, always get 2 quotes to ensure the quote is reasonable. lk

Why do you need 2 doors? Remove one of them and you'll create much more space if you move the toilet. lk

If they are off the ground then cypress should be fine. Differernce between 115x115 and 112x112 is trivial. However speak to the building surveyor as they are the ones who will sign off on it, not me. lk