acidfast sure has posted a great looking bike!
I have a Trek 7.5FX disc which has 445mm chainstays, a Topeak Super Tourist disc rack and Axiom Cartier bags. I never have any heel strike problems and I wear a size 13.
I also just noticed that Trek does not offer the 7.5FX disc for 2013, looks like they replaced it with a new model called CrossRip which looks just like mine except the CrossRip has drop bars.