Ya gotta rip the model to shreds.
I found myself, gently, delicately, holding-my-breath carefully cutting apart the model so that I could trace out all the (too many!) trees. Then just as delicately trying to glue it all back together. Next time - I vowed - I'll photocopy each piece just before I glue it in.
I learn something every day.
As You Like It - Trinity Shakespeare Festival