I too would like to know where they got the model to go with the name. But...there is a Strad Viol in the Shrine to Music...you can see it here:
http://www.usd.edu/smm/Cellos/Stradi...CelloViol.html . The Viol was about cello size...but with the sloping shoulders of a DB. Someone added to it to make it a cello shape...but you can still perfectly see the Viol outline. Someday I intend to turn this viol outline along with the ff holes and blow it up to DB proportions. To me this is what a Strad DB would have looked like had a DB been made by his shop.
Also...when we first started playing with bass shapes...I took the Guarneri template I used for a viola I made and added sloping shoulder to it to see how it would look as a bass. It looked too much like the "Carcassi" basses you see from Eastern Europe.