Thank you - all three of you both for your willingness and your help. I'd forgotten what a great place this is. @PaulOB I really appreciate your suggestion to forget about devices, and make my break points based on design, and to use the media query based on height, which I'd never known was a possibility. It works like a charm.
The site is still in development but in case you are curious, I've uploaded a working version here: [http://jmbroekman.com/ravenhowell/].
Thanks again, so much for your help.