fenland787,
Am no engineer, and know nothing specific to the B787. In the absence of a reply from someone who is and does, however, I'll try to answer your question.
The original photo from the Indian newspaper that Dave Reid has now posted appears to show some part of the fuselage centre-section fairings (falsework). Speaking in general of large airliners, they normally house divers systems equipment such as air-conditioning ducting (and packs, but not sure that applies to the B787), hydraulic reservoirs and accumulators, access to centre (fuel) tank furniture, L/G-door release handles, etcetera. When the main L/G is not in transit, the gear doors typically close to form a smooth profile with the centre-section fairings.
The fairings include panels for maintenance access to some parts of the aforementioned systems. Some panels which are likely to be opened frequently are hinged at the front, and have quick-release fasteners at the back. These are never as large as 4' X 8'. Removable panels of that size are secured by many fasteners, which in my experience are usually of the Dzus type, or similar, necessitating the use of a screwdriver (sometimes with a proprietary head).
The air loads on these panels should always, I think, be upwards/inwards. Damage would be likely only if the leading edge of the panel was hanging down, while the rest of it was secured.