If you're getting too many errors on Courier, maybe your resolution is too low or too high? Can you post a picture (best... add it to the Flickr pool)?
Nevertheless, back to your original question, once you have the .cmodel file, you just use it as an argument to ocropus-lattices, as in the sample script:
ocropus-lattices -m your.cmodel textline.png
ocropus-ngraphs textline.png
Note that if you want to be able to recognized mixed font text, you need to train on a variety of fonts in addition to the one you want to improve on.
Tom