Pillows can be easily bought ... so no drama there.
Not sure what you mean about the loo ... is it a thetford one ... if so then just go to Youtube there are loads of video's on what to do
I don't have a reel for my EHU cable ... but they do sell reels for them
Inverters turn DC (Direct Current) like your batteries put out ... into AC (Alternating Current) like you house electricity
I'm sure someone will tell you if they are a necessity or not ...
Why did it have to go back this morning?
Edit - Forgot to say where are the photo's ...