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I'm running a 203 on the front of my cargo bike with Saint 4 pots.
It's not a dynamo hub but I did build it 3x.
Probably worth saying that it might be overkill for what you need but there's nothing wrong -that I can think of- with building it 3x just because of the flange distance on that hub (if it's the one I'm thinking of)
The only thing that might put me off is if the hub manufacturer says it's a no no.
Thanks for the information @thecycleclinic @Brommers. Also I should mention that these front wheels have disc brakes (4 pot calipers and 203mm rotors). It would seem a bit mad to lace radially but does it still not matter that much?