@Graphicaljordan blast from the past! The site looks great and it looks like you were able to achieve the filtering on the portfolio. Did you end up using the Filter Plugin? I'm trying to achieve a similar treatment for my design portfolio.
Bumping this again to see if @storycolorcrew @JacquiLeigh or anyone else was able to solve it. Seems like a functionality that should be built into Squarespace and not require a plugin.