This paragraph suggests one way to achieve 100% Total Destruction on Angry Birds Surf and Turf level 7. If you have an alternate strategy please feel free to leave a detailed comment below. We would like to publicly thank iamMighty for the textual description and Laurence for the video.
First break the stone barrier in such a way that all the stones get broken or land in the first hollow space. Then use Black to destroy the 2 vertical stones and bomb so that the tower lands on the left side. Use another Black to destroy anything that is on the RIGHT side so that nothing remains there. Then use ME next to the platform (the left slope) where the pile of stones was standing.