Step-by-Step Guide

1. Place the glass roof panels and wall frames along the back platform. Start by snapping the turquoise glass roof sections in a continuous run along the back edge. Under them, set the pale green wall panels between the vertical posts to align with the roof braces, creating a sheltered concourse. Ensure the leftmost end curves into a rounded front canopy and keep the safety yellow edge visible. Center the tunnel arch on the right wall opening.
2. Mount the advertising screen and JR hanging boards on the left. Hang the wide billboard showing a red-capped mountain under the curved canopy. Place two green JR-style hanging boards under the roof beam, angling them for visibility. Add a small white floor light tile beneath each sign.
3. Add bench rows and the vending machine cluster. Line three blue bench groups along the back platform, spacing them evenly. Install a mint-green vending machine pair slightly left of center against the wall, adding a tiny trash bin or service box. Echo the square floor panels near the benches.
4. Position the first-aid mini train car at front-left. Set the rounded-nose mini car with the red cross panel facing left. Inside, place orange reclining seats and a medical cabinet. Add a pink bucket near the door and a white plus sign box outside. Place a potted floor plant to the right of the car.
5. Build the pastel living-room nook in the center. Place a pink armchair and loveseat around a low table with a dessert and drink. Stand a glass partition behind them and string decorative bulbs across the top. Mount a large turquoise panel on the back wall, readable as an aquarium or digital art screen, with two accent sconces above it.
6. Install the instrument rack and coat hooks as a bridge zone. Place a narrow divider wall with a rack holding brass instruments and add a shelf with hooks. Position a slim bench or side table along the back, ensuring safety stripes are visible.
7. Assemble the bar counter, shelving, and stools inside the tunnel lounge. Slide the bar under the tunnel's inner curve. Place back-bar shelving, align stools along the counter, and add a sideboard for glassware. Add a warm wall sconce near the arch mouth.
8. Set the grand piano, tiny stage lights, and corner décor. Position the white grand piano at a slight angle with its bench facing the platform. Add overhead spotlights and a slender post lamp. Tuck a gold accent pedestal between the arch and piano.
9. Finish the right-wall tech: security camera, wall map, door, and digital clock. Install a security camera, hang a metro map panel, and add a utility cabinet and door. Mount the digital clock showing 07:00 outside the tunnel.
10. Populate the front platform: benches, litter, and detail tiles. Place three blue bench segments along the front platform. Scatter floor light tiles and add small "lived-in" objects like a capsule and a white card. Finally, place a bundled traveler along the yellow line.