3D models for race track builders

Hi,

I'm creating a racetrack through Race Track Builder for Assetto Corsa.

I would like to add unique objects to it like:

- Advertising billboards (string objects trackside) and hanging advertising billboards like in the attached picture, to which the sponsor/image attached can be changed.

- Kerbs with specific sets of colors

- Grand Stands

- Pit Buildings

- Building and monuments from a specific city

I would need as an output the blender file, ready to be exported to .fbx so it works into the Xpacker creator and in Racetrack Builder.

I would like to understand the cost of each item.

Some tutorials to understand details:

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Thanks.

Marco