PSE -
f you already have your 01/FFL, all you need to do is pay the SOT. Manufacturing gets a bit more complicated as there can be more entanglements with zoning and waste disposal, but just dealing is a snap, especially if you alrerady have an FFL.
That said, even as an SOT, to get post sample MG's you'll need to get a letter from a law enforcement agency requesting a demo. You don't need the demo letter for transferables or pre-samples though.