All you need is the manufacturer's data sheet and just a few minutes of your time.
Nothing is hidden.
All models and subcircuits are available for viewing and editing. And because model development is so streamlined, you can develop minimum, maximum, typical or worst case libraries to cover all of your simulation needs. The models and subcircuits created in SpiceMod can be stored in .LIB files. This allows all the models to be immediately used in your SpiceNet schematics and IsSpice circuit simulations. They can be used to characterize and evaluate your models, providing feedback on the accuracy of the model and directions on what areas of the model may be tweaked for greater accuracy.