Halo Reach 'New Alexandria' Roblox Build

I want to lay the foundations of New Alexandria inside Roblox Studio so that the map instantly feels familiar to anyone who has flown a Falcon through Halo Reach. The city must sit on several vertical tiers, and every tier has to link convincingly with staircases and ramps—no elevators for now... (Budget: $30 - $250 AUD, Jobs: 3D Design, 3D Graphic Design, 3D Modelling, 3D Rendering, 3ds Max, Game Development, Roblox)