SUCCESS!!!!!! Thank you SO MUCH for all your help in getting this to work.
One last question, does the isotope functionality come from http://isotope.metafizzy.co/? I ask because, if possible, I'd like to try and hard code the grid item and gutter widths (b/c elsewhere in the site, the grid/ gutter values are percentages (to help with responsive layouts) and I would like to keep things consistent). Is that possible? If so, can you point me to the files that I would need to edit?
Again, thanks for helping me figure this stuff out.
Have a great holiday season!