2- possible but what's the context- you mean we only found out aftwards about his not having to add soap?
3- what are 'they'? It looks strange without more context
5- severe (sound doesn't work for me)
6- repetition of situation, unless you mean the second to be plural
9 puttin it up, or better 'building it'- putting up sounds a bit casual to me
15 by the beginning?