Do you really need it in .bin? Couldn't you just as easily use
for example .nrg (Nero) If that would work here's an explanation:

#1. Start up a new compilation
#2. Place all the files in this compilation as you want them in your image-file
#3. Goto the menu-item called 'Recorder' and 'Select Recorder'
#4. Select 'Image Recorder'
#5. Just follow through as you would normally burn a cd in nero..

P.S. You get to select where your image-file is to be saved.

Hope this helps..