Creating 3d supports for the game

As someone who still enjoys the Ultimate Ride Coaster Deluxe game and understands how to mod everything from environment to theme. I'd like to create 3d support, but it appears that the only way I would create custom 3D support is to use cylinder and retopologize it in order to mix edges and create a smooth transition. The 3d support would most likely be in theme setting where varying angles are supported.