[mark_in_manc]

I'd do electrolytic rust removal with something like that, using a caustic soda electrolyte and a bench DC supply to put about 2 or 3 amps through it. Work piece is cathode, anode can be anything - but if you use plasterer's galv mesh you'll lightly galvanise your work piece, which might be a little rough as a finish (I use it as it's so bendy, and I have some). It's a 'line of sight' process so you'll need a few bits of anode to surround your work piece. Process will take all paint off and deal with rust at the same time.

I'm in Whalley Range - if you want to see this working, I could set up a test piece for you. I guess you'd need a big plastic bucket for a computer case, but it's not so very huge.

cheers
Mark