The construction and architectural preparation of the Temple covered every inch of its interior spaces. The work extended across the entire structure, reaching from the wall spaces high above the doorways all the way up to the ceiling [רש״י, מצודת דוד, מלבי״ם]. This thorough preparation spanned both the inner sanctuary, known as the Holy of Holies, and the outer hall. Every single wall was included in this process, without exception [רש״י].
The exact nature of these final preparations is understood in a few different ways. The primary approach among commentators is that the walls were covered with a continuous paneling of large wooden boards, cut and prepared to uniform, precise measurements [רש״י, מצודת דוד, ביאור שטיינזלץ]. This solid wood covering left no empty space and served as the necessary foundation for the gold plating that would eventually coat the entire interior [מצודת דוד]. Building upon this wooden foundation, another perspective suggests that precise architectural sketches were drawn directly onto the walls. Builders measured and outlined exact geometric shapes, such as triangles, squares, and circles, to prepare for the artistic gold engravings that would later be set into place [מלבי״ם]. Alternatively, a more literal approach suggests that every part of the structure simply had clear, known dimensions seen by the prophet. While everything was built to an exact measure, the specific numbers for every single detail were simply omitted from the record [רד״ק, ביאור שטיינזלץ].