Siege Onager Tower [scenario only]

Would anyone like to see a Siege Onager Tower building? It basically a building that can only be made by way of triggers in scenarios. So, no game breaking issues then. Just be a fun OP defense tower. Think about it, it’s basically an armoured siege onager. That’s surely going to be a good defense building.

For scenarios it could be a good tower against mass units and mainly against rams. Is there minimum range and friendly fire?

I’m not sure. The minimum range may needed since it could damage itself due to high blast damage over wide area. (unless there’s somehow a way to stop that) Friendly fire could add an interesting gameplay aspect. Make it a double-edged sword.