You will decide how to build it and what it looks like all by yourself
=You will decide how( you  )( should  )build it and what it looks like( on  )( your  )(own   ).

I sleep during the day,so that I can watch better at night.
=I sleep during the day( in  )( order  )(  to )watch better at noght.I hardly get sick evenif i work a whole day.=I hardly()()even if i work()()

 I hardly get sick even  if i work a whole day.=I hardly( get  )( ill   )even if i work( all  )( day  )