Even with CM3+ I don't think the numbers add up. The 8GB CM3+ is $30, so after buying a hundred you're left with just additional $5 per board for power, interco

Even with CM3+ I don't think the numbers add up. The 8GB CM3+ is $30, so after buying a hundred you're left with just additional $5 per board for power, interconnect and cooling (just like R.Pi 3, the compute module without additional cooling gets thermally throttled really quick). Since you can't run CM3 standalone, you'll be making custom hardware. Even if you don't count your development time, my gut feeling says that $5 is not enough to cover even just BOM costs for such a project.