Our strategy for Ragnahog level 3 is shown in the video below. We used all four birds to get 3 stars.
First toss Red to the upper left corner of the nearest structure, dropping it in the drink and damaging the ship below. Next send Matilda on a high lob, narrowly missing the floating island, bombing the ship and bouncing her carcass into the remaining debris. Stella’s job is to remove as much from that first structure as possible, then send our beloved OB to the right, demolishing the upper structure and tossing debris in all directions. When the dust settled, we had a whopping 149130.