Comics legend and former Marvel Productions staff Romeo Tanghal recently uncovered copies of concept art and early model sheets from Transformers The Movie. Much of the concept art, drawn by Floro Dery, was based on the second Ron Friedman script for the Movie.
Autobot City design
Interiors of Ingestor (Unicron)
The model sheets include early designs for Arcee, Springer, Galvatron, Cyclonus and Wreck-Gar. As well as the Movie design for the repaired, Decepticon-controlled Cybertron.
To view them all in detail and compare to the script that inspired them, head to: The Transformers The Movie page.