All three cards describe a working concept. Floor areas, access and approval requirements have not been confirmed; the existing balcony’s technical and legal status and its integration into a new layout need checking.
The attic also needs assessment of its structure, headroom, daylight and fire-safety design. Its suitability for residential use has not been established.
Residential use of the ground floor could be assessed as an alternative. Three flats are not an approved subdivision, and the café idea is not an established operation, a secured tenant or evidence of demand.