Building Doodad to Unit Conversion problem.

I'm trying to make the Building doodad into a unit, but it's not happening. Trying to place it gets a 'cannot load file' error and trying to build it in game makes only the pathing texture. I'm guessing this is happening because Building is not just one model, but a few. Making City Buildings into units works fine. Does anyone know a way to fix this? It needs to be a unit so that units can be loaded into it and so it can be upgraded in my map.

If no one has any other idea, I'll probably make a building you can't see and put the actual Building doodad over it. I'm trying to get rid of unnecessary work, though.

I had the same problem a while back and it seems you can only convert units into doodads and not vice-versa. I could be wrong, someone else might know. If so I would be interested to know too.

You can make some doodads into units. The City Building doodad works, just not the Building one. I assume any doodad that has only one model will work. It looks like no one knows how to make the multiple model doodads into units. . .