I'm cracking🤯!!! Construction problem

Hello Palians, For several weeks I have been building a large cabin high up on my plot. Having changed my decor to have the sea as a landscape, I am looking to modify my cabin but it is very complicated! The wooden panels that I want to remove are welded in blocks, which will force me to remove entire blocks! basically completely destroy my cabin if I want to have the terraces I want... Can anyone know how to remedy this problem, I'm desperate🥹😭... thank you in advance🥰