Starting wire wheel cleanup of the hardware. Ansen AN305 6" from Amazon on the grinder - excellent wheel
Based on ideas elsewhere on this site, rigged up a makeshift "lathe" and cleaned up the post. Cherne 269913 2 1/2" plug from Amazon and your drill of choice. Cheap HD casters, zip ties and drywall screws. Wet sanded with 60 grit, then 120 then 320, then Collonite paste wax. Unlike what I did, move the pole so that the rollers bear on the part that will be buried permantly in the base so you wont see the line.
Decided on electrolysis for the cast parts, the first piece is in the vat as a trial. It looks pretty good after a few hours so I will probably start the big pieces tomorrow. Rust is gone and the paint just falls off when you touch it. Pretty cool. 1Tbsp washing soda per gallon water, rebar electrodes all tied together with wire, 12v power supply from electronics bench (you can also use a battery charger but it has to be dumb and have an ammeter) - positive to anode bars, negative to part suspended in electrolyte solution. You want 1 - 5 amps. If not, check the connections and contact to the part. No stainless, no copper, no clip leads in water. DO NOT reverse the leads!
George