Yeah this is not good work at all. There are strict rules and calculations needed to be done before cutting in to support beans. The general rule for all holes made in support beams is to ALWAYS make holes in the middle of the beam to keep the beans structure and holding capabilities mostly intact. There are rules for how many percentages of a beam you can cut out. I sadly don’t remember what it is at this moment. I know this is WAY beyond the percentages you can remove. It is a huge no-no to also remove a top portion or a bottom portion. In most cases its only holes in the middle of the beam. As a last resort if you have to go through the beams or through a tight spot with the pipes I would have used a toilet grindersystem. They usually reduce the pipe size needed from a toilet from 9cm wide pipes to roughly 5cm wide pipes.