Yeah I get you. If you have ever played one, you will be aware of the characteristic neck dive they have as a 4 string, so as a long scale with 5 strings it would be a challenge to play comfortably I expect.
For a while now Alembic have stopped making that body style as a long scale bass so a long scale 5 string would be a rare find indeed. harry, one of our members has a 5 string signature though not sure how it's strung but it would be interesting to know how that hangs.