Martin, you can build a car with hand tools but it will take a while. A Wheeling Machine will speed your smoothing and stretching. Shrinking aluminum can be done on a stump or you can do all stretch with smaller panels. If the three power machines you described, I'd vote for the reciprocating machine. I have no idea what is available in Europe.
Having said that, take at look at the MechHammer. It is both a planishing hammer and a reciprocating machine. The developer, Ben Van Berlo is a member here, a good friend, and a heck of a good tool developer and shaper.
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Kerry Pinkerton
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