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Sounds like a good plan. :)

Crawdaddy, From the diagram, it looks like you have the valves downstream from the water block & filter for each tank. If you don't already have this done, in addition to the valves you already have planned, you should also consider installing shutoff valves right off each tank in order to...

That sounds better than rust flakes...sounds like the tank interior is in pretty good shape... :)

I suspect he was referring to rust scale or flakes--these can trap pockets of fuel vapors which can ignite while performing hot work. That's the reason I recommended doing the welding on the plug while water was in the tank. That would eliminate any possibility of ignition. For any other hot...

Crawdaddy, Assuming you can't use the bottom drain fitting on the tank, just fill it with water until the residual liquids in the tank flow out the filler neck. Any petroleum product will float on the water and flow out first. Tilt the tank fore and aft as needed to vent all petroleum product...