That is a good question Bob and I am interested in learning too.
What do you mean with: "The datasheet they provide does not allow to create a material from scratch in SW simulation"
For a static study you need a youngs modulus, poissons ratio, and a density. I found a datasheet here: https://www.stratasysdirect.com/wp-content/themes/stratasysdirect/files/material-datasheets/polyjet/PolyJet_VeroWhitePlu…
The density will not affect your study unless you apply 'gravity' as a boundary condition. The poissons ratio will affect your stress values, but considering the nature of 3D printed constructions (quite inhomogenous and brittle depending on settings) I would say stress analysis will not be very reliable. I would guess a photopolymer like verowhite has a poissons ratio around 0,45.
Just as Gianluca I'm also looking forward to learning the solution to such problem!
Thanks Janko Stellaardfor providing the mamterial specs reference.
http://www.javelin-tech.com/blog/2015/10/solidworks-user-defined-materials/Bob Emac: as we now have those material specs, the only matter is just to create custom material and add it to SW material database as explained here.