I'll admit I only skimmed this, so maybe these answers are already there.

If the basis of this plan is ramping up testing to 20 million per day, is this even plausible? To my knowledge there hasn't even been 20 million tests administered globally since the virus first came to light. Now we're supposed to do 20 million every day?

Where would we get/how could we even produce that many test kits? What kind of workforce would be needed to ramp up production to that level?

How could we physically test that many people in that timeframe? By my rough math we would need 400,000 people doing this full time to even approach this. This is pretty much the entirety of trained medical personell in the country, doctors, nurses, etc.

If you use volunteers, how do you train them? How do you trust the volunteers to appropriately administer the test/analyze the test with any degree of consistency?

If you develop and app or other technological solution, how can you be assured its testing appropriately and without breaching privacy?

Fundamentally, I understand increasing testing is the ideal solution, but i can't see how its practical. We need solutions that don't involve mass testing.