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The best velomobile I've seen is the Rotovelo. It's the only one aside from alleweder that actually has a duruable rotomolded shell.
It's also super simple with regular bike components like a velo should be without all the exotic propietary suspension parts etcetera. Plus it's the cheapest and has the best turning radius.
The downside is that it is not as light or fast as the European velomobiles but it's the only design that is fit for mass adoption