Hi Al, thanks - I received the file through e-mail.

The reason it doesn't come in is because all your objects in the model are made up of block instances, which MoI does not currently read.

You'll need to explode your blocks into regular geometry, then MoI will be able to see them when loading the file.

Also it looks like you've got some blocks-within-blocks, those will need to be exploded multiple times or I think there is some "SuperExplodeBlock" utility that you can use for that in Rhino as well.

- Michael