Modern Roof Garden Room Design

I have already shared photos and an overhead sketch of my roof garden. In the area beside the toilets, close to the small kitchen and the staircase / common zone, I need a detailed 3-D concept that turns a 4 m × 2.3 m footprint into a comfortable, self-contained room... (Budget: $30 - $250 USD, Jobs: 3D Architecture, 3D Design, 3D Modelling, 3D Rendering, 3ds Max, Architectural Visualization, Interior Design, SketchUp)