The engine mounting instructions in the manual work just fine for the BME - I made up a stand off block and mounted the BME to the Hanger 9 mounts and attached it to the standoff block.

This method allowed the engine to be positioned to match the spinner backplate centered on the cowl. I then removed the cowl, removed the engine and the hanger 9 mount, while leaving the standoff block in place.

Just like Tom's instructions said, the standoff block made an ideal drill guide to drill the holes for the blindnuts.