Thanks for the reply, but I still can't get it to work.

#This works when I select everything with a mouse
#I have the transform "t" defined elsewhere
model = Sketchup.active_model.selection Sketchup.active_model.active_entities.transform_entities t,model

......

#I tried this to select everything without the mouse, but it does nothing
model = Sketchup.active_model.selection.add(Sketchup.active_model.entities)
Sketchup.active_model.active_entities.transform_entities t,model

How in Ruby can I select everything (as it now stands I have to use the mouse)?

Where can I find a general overview of groups, models, components and entities?

Some of the models of cars that I have downloaded measure 1' while others are 30' and still others seem to be 400' long. How in Ruby do I automatically find and set the scale so they are "real world" size?

I am new to Sketchup and Ruby.