Mount point or bone placement has absolutely nothing to do with the direction the model will face when exported in game. It is entirely dependent on what direction the model is facing when you export.
Rotate the model 90 degrees clockwise along the red axis and your model will be good.
This isn't really true though. Idk how many times I've had to flip my bones because my Blockhead was sitting in the seat upside down.
I've never actually worked with fbx before in all my years of modeling. It seems by the pre alpha video you released that there are parts of the map that have special properties, such as glowing, textures, etc.
I don't know how well this will translate from Sketchup to FBX but I could try at some point. I'll notify you if I ever find success in my experiments.
To clarify some things:
- Texturing would have to be done a program other than SketchUp. SketchUp does not handle UVs well at all.
- Usually you don't have to worry about file type conversion. Most of the time it's not an issue.
- Some things we can take care of in Unity, and some things I can take care of if needed, if it's not working out for you (UV mapping, for example).
Also... Are you really planning on trying to make a landscape model in SketchUp? Don't let me stop you, but that seems like a tedious endeavor, unless you have some fancy plugin.