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pdlouche-
Commercial makers have a few options when it comes to recumbents; short, mid and long wheel base machines with 3 and 4 wheelers thrown in to make things interesting. All of the above have been around since at least the 30s or 40s.
An example of a short wheelbase recumbent would be the Presto, which was sued out of existence due to safety concerns, I believe...
withered_preacher
Pretty basic DIY recumbent, must weigh a ton.