So, if you can get a Draco or Casablanca to run RTG 3.1 apps you've got about as much compatibility as a MorphOS system (w/o the additional capabilities of a PPC system).
Don't get me wrong, its a neat idea and I really like the idea of a cheap '060 system.
But without chipset compatibilty with other Amigas, we already have better systems that can do what this would, faster, and at a lower price.